🚨 Communication is vital: In disaster scenarios, internet and mobile networks often fail.
Alternative communication methods are essential for coordination and rescue.
1. The Communication Problem in Disasters
Typical failures:
- Mobile network overload: Everyone calls at once → network collapses
- Power outage: Cell towers have only 2-4 hours of backup power
- Internet down: DSL/cable needs power, routers don't work
- Storm damage: Towers knocked down, lines torn
2. Surviving Communication Methods
| Method | Range | Power needed | Special feature |
|---|---|---|---|
| Emergency Radio (FM/AM) | Regional | Battery/Crank | Emergency broadcasts, weather alerts |
| CB Radio (27 MHz) | 5-20 km | 12V / Mains | No license needed, 80 channels |
| PMR Radio (446 MHz) | 1-5 km | Battery/AAA | Walkie-talkie, 16 channels, license-free |
| Amateur Radio (Ham) | Worldwide | 12V / Mains | License required, most reliable system |
| Mesh Messengers | 1-3 km | Smartphone battery | Bridgefy, Briar work without internet |
| SMS instead of calls | Network dependent | Minimal | SMS needs less bandwidth |
| Whistle / Siren | 500m | None | Alarm signal, location marker |
3. Emergency Radio – The Foundation
A battery-powered FM radio is the most important communication source:
- Save frequencies: Local emergency broadcast stations
- Crank radio: No battery needed, built-in flashlight + USB charger
- Emergency alerts: Enable emergency notifications on your phone
- Radio on at night: Important announcements come at any time
4. CB Radio & PMR for Neighborhood Communication
- CB Radio: 27 MHz band, 80 channels, up to 20km range. No license, no fees.
- PMR446: 16 channels, up to 5km. Very easy to use. 8 analog channels, 8 digital (better quality).
- Channel coordination: Emergency: Channel 9 (CB) or Channel 1 (PMR) as meeting point
- Antenna height: Higher = further. Attic, roof, tree.
5. Amateur Radio – The King of Emergency Communication
Amateur radio ("Ham Radio") is the most reliable communication method in disasters:
- License required: Course + exam (approx. $100-200, one-time)
- Range: Shortwave reaches worldwide, VHF/UHF regional (30-100km)
- Emergency communications: Ham radio operators often coordinate rescue when everything else fails
- Join a club: Meet local operators, gain experience
- Equipment: Baofeng UV-5R (approx. $30) – beginner handheld
6. Messengers Without Internet
- Bridgefy: Bluetooth mesh, 100m range, relays through other users
- Briar: Tor-like, encrypted, works over Bluetooth/WiFi Direct
- Manyverse: Decentralized, offline-capable, peer-to-peer
7. Create a Communication Plan
- Family meeting point: Where do we meet if everything fails?
- Out-of-area contact: Someone outside the disaster zone who relays messages
- Short messages: "Safe. At grandma's. 2pm." – Low bandwidth, quickly understood
- Time windows: Daily at 8:00 AM and 8:00 PM radio contact (saves energy)
- Code words: For sensitive information (e.g., "Apple" = house secure)
8. Checklist: Communication
- ☐ Crank radio (FM/AM, with flashlight + USB)
- ☐ Battery radio + spare batteries
- ☐ CB radio or PMR walkie-talkies (2+ units)
- ☐ Smartphone + power bank + solar charger
- ☐ Emergency alert app installed & tested
- ☐ Important phone numbers on paper (not just in phone!)
- ☐ Whistle (location signal)
- ☐ Communication plan on paper