# Avalanche Safety

Avalanche safety gear is four tools for a different job: a transceiver locates a buried signal, a probe pinpoints its depth, a shovel digs hard debris fast, and an airbag pack tries to avoid burial altogether. Product type decides which spec set applies; for airbag packs, cartridge versus electric fan inflation then decides cost, weight, and whether it can fly.

## How it works

A transceiver sends a steady 457 kHz pulse from everyone in 'send' mode; a buried victim's pulse is picked up by companions who switch to 'search' mode and walk toward it, with extra antennas turning a beep into a direction arrow and distance. Close in, a folding probe is pushed into the snow in a grid to find exact depth and confirm a body, not a rock, before anyone digs. A shovel with a rigid blade then clears the often ice-hard, compacted debris fast enough to free an airway within minutes. An airbag pack skips the search: a pulled handle inflates a large bag from a compressed-gas cartridge or a battery-driven fan, making the wearer a bigger object that rises toward the surface of moving snow instead of sinking into it.

## How an expert narrows the choice

```mermaid
timeline
  section 1 · Which tool
    transceiver : ask Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode : skip Probe length, Probe material, Electronic signal detection, Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw, Inflation mechanism, Pack storage volume, Inflated airbag volume
    probe : ask Probe length, Probe material, Electronic signal detection : skip Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode, Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw, Inflation mechanism, Pack storage volume, Inflated airbag volume
    shovel : ask Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw : skip Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode, Probe length, Probe material, Electronic signal detection, Inflation mechanism, Pack storage volume, Inflated airbag volume
    airbag_pack : ask Inflation mechanism, Pack storage volume, Inflated airbag volume : skip Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode, Probe length, Probe material, Electronic signal detection, Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw
    rescue_package_bundle : ask Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode, Probe length, Probe material, Electronic signal detection, Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw : skip Inflation mechanism, Pack storage volume, Inflated airbag volume
  section 2 · Inflation mechanism
    Cartridge-inflated or electric fan airbag?
```

1. **Which tool.** Beacon, probe, shovel, or airbag pack?
   Each tool has its own spec set: a beacon's antennas and range, a probe's length and material, a shovel's blade, or an airbag's inflation system. This fork picks which facet set applies next.
   If transceiver: ask Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode; skip Probe length, Probe material, Electronic signal detection, Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw, Inflation mechanism, Pack storage volume, Inflated airbag volume.
   If probe: ask Probe length, Probe material, Electronic signal detection; skip Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode, Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw, Inflation mechanism, Pack storage volume, Inflated airbag volume.
   If shovel: ask Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw; skip Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode, Probe length, Probe material, Electronic signal detection, Inflation mechanism, Pack storage volume, Inflated airbag volume.
   If airbag_pack: ask Inflation mechanism, Pack storage volume, Inflated airbag volume; skip Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode, Probe length, Probe material, Electronic signal detection, Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw.
   If rescue_package_bundle: ask Antenna count, Search strip width, Multiple-burial handling, Auto-revert to transmit, Group check mode, Probe length, Probe material, Electronic signal detection, Blade material, Handle grip, Extendable handle, Hoe/dozer conversion, Handle length, Blade size, Shovel weight, Integrated snow saw; skip Inflation mechanism, Pack storage volume, Inflated airbag volume.
   Skip if already known: a query that already names 'beacon'/'transceiver', 'probe', 'shovel', or 'airbag pack'.

2. **Inflation mechanism.** Cartridge-inflated or electric fan airbag?
   Only matters once an airbag pack is the item. Cartridge versus fan decides price, weight, whether it flies charged, and what happens after a deployment.
   Skip if already known: a query that already names a cartridge/canister or an electric/fan/battery airbag system, an earlier answer naming product_type as anything other than airbag_pack.

## What to surface

### Which tool

Whether the listing is a transceiver (beacon), a probe, a shovel, an airbag pack, or a bundled rescue package of the first three. Each tool is judged on a totally different spec: a beacon on antennas and range, a probe on length and material, a shovel on blade material, an airbag pack on how it inflates. Asking this first avoids asking about antennas on a shovel. [3]

Values: transceiver, probe, shovel, airbag_pack, rescue_package_bundle.
Question to ask: Beacon, probe, shovel, or airbag pack?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Almost always explicit in the product title or category ('avalanche beacon', 'avalanche probe', 'avalanche shovel', 'airbag pack', or a 'rescue package' bundling several).
Title and category keyword match covers nearly every listing.

### Inflation mechanism

How the airbag pack inflates: a compressed-gas cartridge fired on deployment, or a battery-driven fan. A cartridge system is cheaper and lighter but the charged canister can't be carried onto a commercial flight and must be refilled, even after a practice deployment. A fan system runs on a rechargeable battery, flies without restriction, and allows several practice deployments on one charge, but costs more and weighs more. [2] [3] [12]

Values: compressed_gas_cartridge, electric_fan.
Question to ask: Cartridge-inflated or electric fan airbag?

Used as: top-level split, filter. Data: on the listing, backfill cost low. Look for it as: Usually explicit in the product name or description, since it's a headline selling point (e.g. 'JetForce BT' fan models versus cartridge-named models).
Brand/model naming and the description almost always state it.

### Blade material

What the shovel's blade is made of: aluminum or a plastic/polycarbonate blade. Aluminum holds up to chopping through wind-hardened, often ice-hard avalanche debris; plastic blades are lighter for digging snow pits but are harder to quality-control and go brittle in the cold, so they aren't recommended for avalanche rescue and nearly every dedicated rescue shovel on the market uses aluminum. Reinforcing ribs or raised sides add strength for little extra weight, a buying-guide criterion in their own right. [6] [5]

Values: aluminum, plastic_or_polycarbonate.
Question to ask: Aluminum blade, or a plastic one?

Used as: filter, shown on the card. Data: needs research, backfill cost low. Look for it as: Rarely spelled out since aluminum is assumed; a plastic blade is usually flagged as a lightweight feature when it's used.
Default to aluminum when the listing says nothing, since that's nearly every dedicated rescue shovel on the market.

### Probe length

The probe's extended length in centimeters, typically 240 to 330cm. A longer probe reaches deeper burials and lets the rescuer probe repeatedly at full reach without crouching lower each time, but it packs down longer and weighs more. 240cm is the common minimum; guides and pros often carry 300cm or longer. [9] [13]

Range: 240 to 330 cm. 240cm is the common minimum; 270 to 300cm is a common all-round length, with 300cm also the length of Pieps's own flagship electronic probe.
Question to ask: How long a probe — 240cm or longer?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Almost always in the product title, e.g. 'Stealth 240 Carbon Avalanche Probe'.
Title has the number directly in nearly every listing.
Chart: position on a cm scale, longer probes further right.

### Electronic signal detection

Whether the probe is a plain mechanical pole, or an 'electronic probe' that senses an active transceiver's signal as it passes it and gives an alert. An electronic probe confirms a strike is actually a transceiver, not a rock or branch, and signals the instant it crosses the buried unit, which can speed the final pinpointing phase in a deep or confusing burial. It costs several times more than a plain probe and needs its own battery. [13] [9]

Values: mechanical, electronic_signal_sensing.
Question to ask: A plain probe, or one that senses the beacon signal itself?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Named outright in the model name, e.g. 'iPROBE BT+', versus an unmarked mechanical probe.
Default to mechanical when unstated, since it is still the overwhelming majority of probes sold.

### Pack storage volume

How much gear-storage volume the airbag backpack holds, in liters, separate from the airbag itself. A smaller pack suits a resort lap or short tour; a larger one carries overnight gear, but adds weight and bulk around the airbag's own hardware. Current packs run from about 10-15L minimal designs up to 45L multi-day packs. [10] [12]

Range: 10 to 45 liters. Most day-touring airbag packs run 15-35L; minimal resort packs go down to about 10-15L, multi-day packs up to 45L.
Question to ask: How many liters of pack space do you need?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Usually embedded directly in the model name, e.g. 'E2-25' or 'JetForce BT 25'.
Parse the liter number out of the model name; almost every listing carries it there.
Chart: position on a liters scale, bigger pack further right.

### Antenna count

How many receiving antennas a digital transceiver has inside its case: two or three. A third antenna lets the unit show a direction arrow and closing distance instead of just a tone, which is why three-antenna models are now the industry standard over the older two-antenna design. But antenna count alone doesn't guarantee a wider search strip; the signal processing behind it matters just as much. [1] [4]

Values: two, three.

Used as: filter, shown on the card. Data: needs research, backfill cost low. Look for it as: Usually in the brand's spec table under a 'technology' or 'antenna' row, rarely stated plainly in a retail listing title.
Brand spec pages carry it for every current model; default to three for anything released in the last decade unless stated otherwise.

### Multiple-burial handling

How the beacon helps when more than one person is buried: a basic indicator that more than one signal is present, a mark-and-exclude function to flag a found victim's signal, or full per-victim distance and direction. A group burial is where a basic beacon falls apart: without a way to flag a found signal, it keeps pointing at whichever transmitter is strongest, often the one already found. Mark-and-exclude and full multi-victim resolution let a rescuer move on instead of re-finding the same person. [4] [8] [11]

Values: basic_indicator_only, mark_and_exclude, full_multivictim_resolution.

Used as: filter, shown on the card. Data: needs research, backfill cost low. Look for it as: Named in the brand's own feature chart or product description ('multiple burial', 'mark and exclude', 'scan mode', 'victim selection'), rarely on a generic retail listing.
Default to mark_and_exclude for anything from a reputable brand in the last decade, since most basic current models now include it.

### Auto-revert to transmit

Whether the beacon automatically switches itself from search back to send mode after sensing no motion for a set time, in case its own user is caught in a second slide. If the searcher gets buried by a secondary avalanche, a beacon stuck in search mode broadcasts nothing; auto-revert switches it back to transmitting on its own so the rest of the group can still find that person. It is standard on current flagship models but sometimes dropped on a cheaper tier of the same lineup. [4] [8] [11]

Values: no_auto_revert, auto_revert_to_transmit.

Used as: filter, shown on the card. Data: needs research, backfill cost low. Look for it as: Named directly in the feature chart or spec sheet as 'auto revert' or 'auto-revert to send/transmit'.
Default to auto_revert_to_transmit for current flagship/mid-tier models; check the spec sheet for stripped-down entry models, which sometimes omit it.

### Group check mode

A dedicated mode that confirms every beacon in the group is actually transmitting and receiving correctly before setting out. Most beacon failures found in the field are a dead battery or a unit left in the wrong mode, caught by a quick group check before leaving the trailhead rather than after a burial. Some brands bundle it into a 'pro-mode' check that also verifies signal strength. [4] [11]

Values: no_dedicated_group_check, group_check_mode.

Used as: filter, shown on the card. Data: needs research, backfill cost low. Look for it as: Named in the spec sheet or manual as 'group check' or 'group check pro-mode'.
Default to group_check_mode for current models from major brands; it has become close to standard.

### Probe material

What the probe's sections are made of: aluminum or carbon fiber. Carbon fiber cuts the weight carried on every tour but costs more; aluminum is heavier but cheaper and more resistant to the repeated hard probing a guide or patroller does in debris. [9] [15]

Values: aluminum, carbon_fiber.
Question to ask: Aluminum probe, or lighter carbon fiber?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Almost always in the title, e.g. 'Stealth 240 Carbon Avalanche Probe' versus an unmarked (aluminum) model.
Title keyword match; default to aluminum when the title says nothing, since it's the baseline material.

### Handle grip

The shovel handle's grip shape: a T-grip crossbar or a bulkier D-grip loop. A T-grip is light and fine bare-handed but awkward with thick gloves or mittens; a D-grip is heavier but easier to hold and push while wearing mittens, which matters when digging fast in the cold. [5]

Values: t_grip, d_grip.
Question to ask: T-grip handle, or D-grip?

Used as: filter, shown on the card. Data: needs research, backfill cost low. Look for it as: Usually named in the product description rather than the title.
Default to T-grip when unstated, since it's the lighter, more common default.

### Extendable handle

Whether the shovel's shaft telescopes to a longer length, or is fixed. A longer shaft gives more leverage for fast digging and better reach into a hole, at the cost of some weight and a moving part that can jam with ice; it has become close to standard on current touring shovels. [6] [5]

Values: fixed_length, telescoping.
Question to ask: Fixed-length handle, or one that extends?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Usually named in the description as a 'telescoping' or 'extendable' shaft; a fixed shaft is rarely called out.
Default to telescoping for anything marketed as a touring/avalanche shovel in the last several years.

### Hoe/dozer conversion

Whether the blade can pivot roughly 90 degrees from the shaft to work like a hoe, for scraping or chopping downward, instead of only scooping like a standard shovel. Hoe mode moves far more snow per stroke when clearing hard avalanche debris or cutting a snow pit wall, which is why many guides treat it as close to a must-have; it adds a hinge that is one more thing to jam with ice or fail under load. [6] [5]

Values: scoop_only, hoe_convertible.
Question to ask: Scoop-only shovel, or one that converts to a hoe?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Named in the description or model name (BCA's Dozer 'H'/'D' suffixes, Ortovox's 'converts to a hoe').
Check the product description; roughly half of current avalanche shovel lines offer a hoe-convertible model alongside a scoop-only one.

### Shovel weight

The shovel's total weight in grams, blade plus handle. Every gram is carried on every tour, so weight is a direct trade against blade size, an integrated saw, and a telescoping handle; current avalanche shovels range from about 600g for a minimal blade-and-shaft design up to roughly 950g for a full-size pro shovel with a saw. [6] [14]

Range: 600 to 950 grams. Lightweight touring shovels run 600-800g; a full pro shovel with an integrated saw adds up toward 950g.
Question to ask: How much shovel weight are you willing to carry?

Used as: filter, shown on the card, sortable. Data: on the listing, backfill cost low. Look for it as: Usually stated directly in the spec sheet as shovel or 'total' weight.
Spec sheets carry it for nearly every model; default to the 700-800g range when unstated.
Chart: position on a grams scale, lighter further left.

### Integrated snow saw

Whether the shovel ships with a snow saw built into or attached to the blade/handle, for cutting snow-stability test blocks or snow shelters. A saw adds real capability for snowpack testing and shelter-building beyond rescue digging, but it is extra weight and cost that a buyer focused purely on rescue speed may not need; reviewers tend to call it a nice extra rather than essential. [14] [6]

Values: no_saw, integrated_saw.
Question to ask: A built-in snow saw too, or not?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Named directly in the product title or description when present, e.g. 'integrated snow saw'.
Default to no_saw unless the title/description specifically mentions a saw.

### Search strip width

The width of ground, in meters, that one sweep of a transceiver search reliably covers, which sets how far apart search passes across a slope need to be. This is the number that actually determines search speed, not the headline 'max range', which describes best-case initial signal pickup rather than reliable pinpointing distance. A wider strip means fewer passes to cover the same slope. [7] [11]

Range: 55 to 80 meters. Most current models sit around 50 to 55 meters; flagship models reach 70 to 80 meters.

Used as: shown on the card, sortable. Data: needs research, backfill cost low. Look for it as: Stated on the brand's own spec sheet, separate from 'max range'; rarely carried on a general retail listing.
Brand spec pages carry it for every current model.
Chart: position on a meters scale, wider strip further right.

### Blade size

The shovel blade's surface area in square centimeters, from its length and width. A bigger blade clears more snow per stroke, which matters most once debris is deep, but it's heavier and packs down bigger; current avalanche shovels run from a compact 'minimal' size around 630cm² up to a large pro-size blade near 745cm². [6] [14]

Range: 630 to 745 cm2. Most touring shovels sit near 630-710cm²; larger pro/rescue blades run up to about 745cm².

Used as: shown on the card, sortable. Data: needs research, backfill cost medium. Look for it as: Rarely stated as an area; usually given as blade length x width in the spec sheet, which needs multiplying.
Requires computing length x width from the spec sheet; not usually a single listed number.
Chart: position on a cm² scale, bigger blade further right.

### Handle length

The shovel's handle/shaft length in centimeters, extended, separate from the blade. A longer handle gives more leverage and reach while digging without crouching, at the cost of packing down bigger; current touring shovels range from about 59cm extended on a compact model up to 80cm on a full pro shovel. [14] [19]

Range: 59 to 80 cm. Compact telescoping shovels extend to roughly 59-65cm; full pro shovels reach closer to 80cm.

Used as: shown on the card, sortable. Data: needs research, backfill cost medium. Look for it as: Rarely in the title; usually a 'handle length' or 'extended length' row on the brand's own spec sheet.
Requires the brand spec sheet's extended handle/shaft length row, not usually on a retail listing.
Chart: position on a cm scale, longer handle further right.

### Inflated airbag volume

The volume of the airbag itself once fully inflated, in liters, which creates the floating/air-pocket effect, not the pack's gear capacity. A bigger inflated bag makes the wearer a larger object relative to moving snow (stronger inverse segregation) and can leave a larger air pocket if a full burial still happens; EN 16716 sets a 150-liter floor, and current systems inflate up to around 200 liters. [2] [17]

Range: 150 to 200 liters. EN 16716 requires at least 150 liters inflated; some current fan systems inflate to around 200 liters.

Used as: shown on the card. Data: needs research, backfill cost high. Look for it as: Rarely on a retail listing; stated on the brand's own technology page, if at all.
Only available from brand marketing/technology pages, not consistently published; treat as a background fact rather than a filterable field.
Chart: position on a liters scale, bigger inflated volume further right.

## What you give up

- A fan-powered airbag can fly on commercial flights and be test-fired and repacked several times on one battery charge, but it costs more and weighs more than a compressed-gas cartridge, which is cheaper and lighter but can't travel charged on a plane and must be refilled after every deployment, including practice. [2] [3] Board branch: "See more fan-powered airbag packs".
- A larger blade near 700-745cm² clears more snow per stroke once debris is deep, but current shovels show real weight spread (600-950g), and the biggest blades tend to sit at the heavier end. [6] [14] Board branch: "See more large-blade shovels".

## Words you will meet

- **Transceiver / beacon**. A small radio device every group member wears, switched to 'send' to broadcast a signal and to 'search' to receive a buried companion's.
- **Search strip width**. The width of ground one sweep of a transceiver search reliably covers, so a wider strip means fewer passes across a slope.
- **Antenna**. A small coil inside the transceiver that senses the buried signal's direction; more antennas usually help compute a clearer arrow and distance.
- **Mark-and-exclude**. A beacon function that lets the rescuer flag a found victim's signal and ignore it, so the display points toward the next buried person instead.
- **Auto-revert**. A safety feature that switches a beacon from search back to send mode on its own if its user stops moving, in case of a second avalanche.
- **Group check**. A quick pre-trip routine, sometimes a dedicated beacon mode, that confirms every beacon in the group is sending and receiving correctly.
- **Probe**. A long, thin, collapsible pole pushed into the snow in a grid pattern to find a buried person's exact depth before digging.
- **Electronic probe**. A probe with built-in electronics that senses a buried transceiver's signal directly and alerts the rescuer the instant it crosses it.
- **Airbag pack**. A backpack with a folded airbag built in; pulling a handle inflates it fast, making the wearer a bigger object the moving snow tends to push up.
- **Rescue package bundle**. A transceiver, probe and shovel — avalanche safety's 'Big Three' — sold together as one packaged kit instead of three separate purchases.
- **Cartridge**. A small canister of compressed gas that inflates an airbag pack instantly when the trigger handle is pulled, and must be refilled after use.
- **Inverse segregation**. The physics behind an airbag pack: in a flowing avalanche, smaller particles sink and bigger objects rise, so a big inflated bag helps keep the wearer near the surface.
- **T-grip / D-grip**. The two common shovel handle shapes: a T-grip is a light crossbar gripped between the fingers; a D-grip is a bulkier loop easier to hold with mittens on.
- **Hoe mode**. A shovel feature where the blade pivots about 90 degrees from the shaft so it can scrape or chop like a hoe instead of only scooping.
- **Telescoping handle**. A shovel shaft that slides or locks out longer for more digging leverage, then collapses back down to pack smaller.
- **Snow saw**. A small serrated blade built into or attached to a shovel, used to cut snowpack test blocks or shape snow shelters.

## Where we made a call

- More antennas alone doesn't guarantee a wider search strip; electronics and signal processing matter as much as antenna count. (confidence medium). Sources disagree. REI and Wikipedia call three-antenna the standard, but Pieps's dual-antenna Pro IPS posts an 80m search strip versus BCA's three-antenna 55m, so antenna count alone isn't a reliable proxy for range. [4] [1] [11] [7]
- BCA's own Tracker S lacks auto-revert that its Tracker 4 and 3+ include; same brand doesn't guarantee the same safety feature. (confidence high). Confirmed directly from BCA's own feature-comparison chart, which lists Auto Revert as present on Tracker 4 and 3+ but blank for Tracker S. [8]
- Transceivers must meet ETSI's governing radio standard, not just 'operate at 457kHz' informally. (confidence high). ETSI EN 300 718-1 specifies avalanche beacon transceivers at 457kHz with a frequency error no greater than ±80Hz; Wikipedia's own standards list corroborates the 457kHz/±80Hz figures. [16] [1]
- Airbag packs are governed by EN 16716, which sets a 150L minimum inflated volume and a 5-second full-inflation requirement. (confidence high). EN 16716:2017 requires the fully inflated airbag to reach at least 150 liters within 5 seconds and keep working from -30°C to +50°C; a compliant product (Mammut's Removable Airbag System 3.0) independently states the same 150L/3-5s figures. [17] [18]

## References

1. [Avalanche transceiver](https://en.wikipedia.org/wiki/Avalanche_transceiver) (primer). Supports: 457 kHz is the international standard transceiver frequency, adopted by 1996/1997; A digital transceiver needs at least two antennas; most modern units have three.
2. [Avalanche airbag](https://en.wikipedia.org/wiki/Avalanche_airbag) (primer). Supports: Airbags work by making the buried person a larger object that rises in moving granular snow; Compressed-gas/explosive canisters must be emptied to fly commercially; a 2014 system used a battery fan instead; A battery-fan system inflates a 200-litre bag in about 3.5 seconds.
3. [Avalanche Safety Gear (REI Expert Advice)](https://web.archive.org/web/20251107185140/https://www.rei.com/learn/expert-advice/avalanche-safety-gear.html) (specialist review). Supports: Beacon, probe and shovel are 'the Big Three' essential pieces of avalanche gear; Fan-style packs fly and reuse up to six times per charge; cartridge packs are cheaper but can't fly charged; Longer probes improve probing efficiency; bigger shovels move snow faster.
4. [How to Choose an Avalanche Transceiver (REI Expert Advice)](https://web.archive.org/web/20260703225239/https://www.rei.com/learn/expert-advice/avalanche-transceiver.html) (specialist review). Supports: All modern transceivers use a three-antenna design, now the industry standard over older two-antenna models; Most reputable brands offer multiple-burial tracking and a marking/flagging function even in basic models; Auto-revert-to-transmit switches a motionless beacon back to send mode in case of a secondary avalanche; A group check confirms every beacon's send and search modes work and are compatible before setting off.
5. [How to Choose a Snow Shovel (REI Expert Advice)](https://web.archive.org/web/20260508091158/https://www.rei.com/learn/expert-advice/snow-shovel.html) (specialist review). Supports: Aluminum predominates for avalanche shovels for its low weight and high strength; plastic shovels aren't suited to avalanche rescue; T-grip handles are light but awkward in mittens; D-grip handles are heavier but easier to hold with mittens; Some shovels convert to a 90-degree hoe angle for scraping or chopping instead of scooping; Longer, extended shafts give more leverage; shorter shafts save weight and pack space.
6. [Avalanche Rescue Shovels Overview](https://wildsnow.com/26885/avalanche-rescue-shovels-overview-2019/) (enthusiast community). Supports: Aluminum, not plastic, is recommended for rescue shovel blades; plastic is harder to quality-control and temperature sensitive; An extendable handle has become standard, if not mandatory, and a hoe/dozer feature is desirable; Compared blade dimensions run from 24.9x25.4cm to 25.4x27.9cm across popular current models; Compared shovel weights run from 600g to 947g (with saw) across popular current models; An integrated snow saw is a useful but non-essential extra on a rescue shovel.
7. [BCA Tracker S Avalanche Beacon (spec sheet)](https://backcountryaccess.com/en-in/p/bca-tracker-s-avalanche-beacon-c2312001) (spec sheet). Supports: Tracker S: 457 kHz, three antennas, 50m max range, 55m search strip width.
8. [BCA Tracker 4 Avalanche Beacon (spec sheet)](https://backcountryaccess.com/en-in/p/bca-tracker-4-avalanche-beacon-2027) (spec sheet). Supports: Feature chart compares Auto Revert, Signal Suppression and Big Picture modes across Tracker 4, 3+, and S; Auto Revert mode is present on Tracker 4 and 3+ but blank for Tracker S; USB port enables downloadable firmware/software updates on Tracker 4.
9. [Avalanche Probes (BCA category/spec listing)](https://backcountryaccess.com/en-in/c/rescue-gear/avalanche-probes/) (spec sheet). Supports: BCA Stealth probes come in 240, 270, 300 and 330cm lengths, in aluminum or carbon fiber; BCA's Quick-Lock system is marketed as its probe locking mechanism.
10. [Avalanche Airbags (BCA Float category listing)](https://backcountryaccess.com/en-in/c/airbags-backpacks/avalanche-airbags/) (spec sheet). Supports: BCA's Float E2 airbag line spans E2-15, E2-25, E2-35 and E2-45 models by liters of pack storage.
11. [Pieps Pro IPS (spec sheet)](https://www.pieps.com/en/product/pro-ips/) (spec sheet). Supports: Pro IPS: dual-antenna design, 457 kHz, 70m max range, 80m search strip width; Scan mode and Victim Selection give per-victim distance and direction in a multiple-burial search; Auto-Revert Search-to-Send and a Group Check Pro-Mode are listed as named features.
12. [Pieps Jetforce BT 25 (product page)](https://www.pieps.com/en/product/jetforce-bt-25/) (spec sheet). Supports: Jetforce's rechargeable battery and jet fan allow up to four airbag inflations at -20°C; auto-deflates 3 minutes after deployment; Jetforce BT 25: 25-liter pack volume, 2.98kg weight, boosters of 10/25/35 liters available; The Jetforce fan creates a 170-liter breathing cavity after automatic airbag deflation.
13. [Pieps iPROBE BT+ 300 (spec sheet)](https://www.pieps.com/en/product/iprobe-bt-plus-300/) (spec sheet). Supports: iPROBE BT+ 300: electronic signal detection with optical/acoustic feedback, highlighted depth markings at 100cm and 150cm; 7 tubes, 12.5mm diameter, 300cm length, Quick-Lock mechanism.
14. [Pieps Shovel T825 pro+ (spec sheet)](https://www.pieps.com/en/product/shovel-t825-pro/) (spec sheet). Supports: SHOVEL T825 pro+: 30.5x24.4cm blade, 825g total weight, integrated snow saw, telescopic handle; Handle length (cm): 80.
15. [PIEPS GmbH (home/product overview)](https://www.pieps.com/en/) (spec sheet). Supports: Pieps offers aluminum, carbon, competition-ultralight, and electronic iPROBE probe lines.
16. [ETSI EN 300 718-1 (Avalanche Beacons at 457 kHz, draft V2.1.0)](https://cdn.standards.iteh.ai/samples/47952/856433f551f64564a33898b99b00099a/ETSI-EN-300-718-1-V2-1-1-2018-01-.pdf) (spec sheet). Supports: Specifies technical characteristics and measurement methods for 457kHz avalanche beacon transmitter-receiver systems; Frequency error of the transmitter shall not exceed ±80Hz at 457kHz.
17. [EN 16716 Avalanche Airbag Systems (Edelrid standard summary)](https://edelrid.com/040-downloads/Normen_DE_EN%2016716_PDF.pdf) (spec sheet). Supports: The fully inflated airbag must have a minimum volume of 150 liters; Airbag must be fully inflated within 5 seconds and hold for 3 minutes; System must work between -30°C and +50°C without damage.
18. [Mammut Removable Airbag System 3.0 (user manual)](https://www.manua.ls/mammut/removable-airbag-system-30/manual) (spec sheet). Supports: Fill time of about 3 to 5 seconds and inflated volume of 150 liters; Complies with EN 16716:2017 and PPE Regulation (EU) 2016/425.
19. [BCA Dozer 1T-UL Avalanche Shovel (spec sheet)](https://backcountryaccess.com/en-us/p/dozer-1t-ul-avalanche-shovel-2526) (spec sheet). Supports: Handle & Shaft Extended Length: 23.25 in / 59 cm; Certified to the UIAA 156 standard for avalanche rescue shovels.