Signalling and two-way radios: staying in contact without a network

What licence-free radios really do

PMR446 handsets are legal to use without a licence across Europe and are ideal for keeping a household or working group in contact. Advertised ranges assume clear line of sight; in a built-up area expect one to two kilometres, and less inside buildings.

Range depends on obstruction and height, not on the number printed on the packaging. Standing on a rise or an upper floor transforms a marginal link into a clear one.

• Set a primary channel and one fallback before separating
• Fixed check-in times save battery versus leaving radios on
• Rechargeable packs plus an AA fallback tray if available
• Keep transmissions short — batteries drain while transmitting

Signalling without electronics

A pealess whistle carries much further than shouting and works when you are exhausted. Six blasts, pause, repeat is the recognised distress pattern in Europe; three of anything is the general call for help.

A signal mirror is effective over remarkable distances in sun, and a torch on a slow flash covers the same job at night. Bright fabric, a headtorch left on and reflective tape all make you findable, which is the real objective.

The survival scenario: searching a flooded neighbourhood

Two people check on neighbours after flooding while one stays at a base. Phones are unreliable and the streets are noisy with water and generators. Radios plus a whistle mean the pair can call for help and the base knows where they are.

Set a simple discipline: check in every fifteen minutes, always say where you are before what you need, and if a check-in is missed twice, the base acts. Simple rules like that are what make comms gear useful rather than decorative.