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Devices that use satellite networks to send messages and SOS alerts; essential in remote areas without cell service.

Harnessing sunlight to create visible signals (flashes) that can be seen from long distances and even by aircraft.

Portable devices that, once activated, transmit a distress signal to search and rescue services via satellite system.

Gestures used to convey messages without words; useful in situations where verbal communication is not possible due to distance or noise.

Audible signals used for sending alerts and messages over a distance; the pattern of blasts can denote specific messages.

Loud, hand-held devices that emit a piercing noise; useful for signaling in emergencies when traveling by waterways or in dense terrain.

Brightly colored non-adhesive tape used to mark trails, routes or areas of interest; not a direct communication method but helps with navigation and group coordination.