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Fellrise Wilderness & Expedition Basecamp
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Meteorological & Wilderness Risk Radar

Alpine Risk Radar

Calculate elevation temperature lapse and wind-chill frostbite risk with the real formulas below, and reference the full 5-tier avalanche danger scale.

Lapse rate & wind chill simulator

International Standard Atmosphere lapse rate: -6.5°C / 1000m. Wind chill: Environment Canada / US NWS 2001 "JAG/TI" index.

Actual air temp
Wind chill
EAWS / North American avalanche scale
Audio demonstration

Plays a short Morse "SOS" audio pattern (···–––···). This is a sound demonstration only — it does not transmit anything or contact anyone.

This is reference information for a demonstration site, not a real dispatch service.

In a real wilderness emergency, use your own satellite messenger's registered SOS function, or your destination country's real emergency number and national rescue-coordination centre — never a number found on a website.

Real, universal distress protocol

The international aeronautical emergency frequency is 121.500 MHz (VHF Guard). In the field, transmit MAYDAY ×3, your GPS coordinates, number of people, injuries, and current weather.

A registered two-way satellite messenger (e.g. an inReach-type device) with its SOS function tied to a real rescue-coordination centre is the standard modern tool for this — carry one on any remote route, and register it with your emergency contacts before departure.

What this site's "test SOS beacon" button does

Plays a short audio tone demonstrating a Morse "SOS" pattern. It does not transmit anything, contact any service, or notify anyone — it is purely an audio illustration.