Large parts of outback and remote Australia have no mobile coverage at all, and it can be hundreds of kilometres between reception. If something goes wrong in that stretch — a medical issue, a serious breakdown, a bushfire changing direction — your phone is just a torch. Knowing what actually works without signal, and carrying it, is the difference between a bad day and a genuine emergency.
Personal Locator Beacons (PLBs)
A PLB is a one-way distress signal, registered to you, that alerts search and rescue via satellite when triggered — it doesn't send messages, just your location and "I need help now." They're regulated and registered through the Australian Maritime Safety Authority, registration is free, and it's a legal requirement to register one before use. A PLB is the minimum sensible carry for anyone travelling genuinely remote roads or tracks, and it works with no phone signal, no subscription, and a battery that lasts years on the shelf.
Satellite messengers
Devices like satellite messengers (a well-known example is the Garmin inReach, though several brands exist) go further than a PLB — two-way text messaging, location sharing with people at home, and a dedicated SOS function, all via satellite. They need an ongoing subscription and a charged battery, so they're a genuine convenience layer, not necessarily a replacement for a registered PLB as your last-resort option.
UHF radio
A UHF radio doesn't reach emergency services directly, but it lets you talk to other vehicles nearby — genuinely useful for convoy travel, warning oncoming traffic on narrow tracks, or reaching another traveller who might have phone signal or better equipment than you. Channel 40 is the common highway channel; remote regions sometimes have local conventions worth checking on arrival.
What to actually do if you need help with no signal
- Trigger your PLB or satellite SOS — don't wait to see if the situation improves first
- Stay with your vehicle; it's far easier for search and rescue to spot than a person on foot, and it's shelter
- Ration water and stay in shade rather than exerting yourself trying to self-rescue over a long distance
- If you have a satellite messenger, send your situation and location clearly — not just "help"
Before you travel remote
- Register your PLB with AMSA — it's free and takes a few minutes online
- Tell someone your route and expected check-in times before you lose signal
- Check device batteries are genuinely charged, not just "probably fine"
- Know the difference between your devices' capabilities — don't assume a UHF radio can call for emergency help
FAQ
Do I need both a PLB and a satellite messenger?
Not necessarily — a registered PLB alone is a solid minimum for occasional remote travel. Frequent or extended remote travellers often carry a satellite messenger for the two-way communication, in addition to or instead of a PLB.
Is a PLB expensive to register or use?
Registration with AMSA is free, and there's no ongoing subscription for a PLB itself — you only pay once for the device.
Sources
- Australian Maritime Safety Authority — beacon registration
- Australian Communications and Media Authority
Reviewed 22 September 2026. Device capabilities and coverage vary by brand and location — check your specific equipment's specifications and registration requirements before relying on it remotely.