A mobile phone works fine at the marina. It stops being useful the moment the engine dies six miles out or someone goes over the side. VHF talks directly to nearby boats and patrol craft without a network or a cell tower, and everyone on the water is listening on the same channel. That is the difference between being reachable and being alone.
A fixed-mount set is wired to the boat's battery and feeds a tall antenna, so it transmits further โ typically 20 to 30 kilometres from a small boat. A handheld is convenient but limited: realistically 3 to 8 kilometres on open water, less in a swell. If you own the boat, fit a fixed unit and keep a handheld sealed in a waterproof bag as backup. Antenna height matters more than wattage; every metre you gain clears more of the horizon.
Channel 16 is the calling and distress channel. You listen on it, you hail on it, then you move to a working channel immediately. Long conversations on 16 block the one frequency everyone depends on. A correct call is short: the vessel you want, three times; your vessel; then a working channel such as 72. Keep it under fifteen seconds and clear the channel.
The words are not interchangeable. MAYDAY means grave and imminent danger to life โ sinking, fire, someone unconscious. PAN PAN means urgency without immediate danger to life โ engine failure, a tow, a medical issue that is stable. SECURITE warns everyone of a hazard: drifting debris, a dangerous sea state, a navigational risk. You repeat the word three times so every set in range stops and listens.
MAYDAY example: "MAYDAY MAYDAY MAYDAY. This is Rahma, Rahma, Rahma. Position five miles east of Shuaiba, engine failed, taking water. Two persons on board, require immediate assistance. Over." Then stop transmitting, stay on 16, and answer the first station that replies. If nobody answers, repeat after a short pause and try a second channel or a relay through another vessel.
A listening watch is half of safety. The radio does not need to be in your hand, but it does need to be on and audible. Handheld batteries drain fast when you transmit often, so carry a spare or a waterproof power bank and charge before you leave the dock. Inside a cabin, under direct sun, or in a swell, handheld range drops to two or three kilometres โ never treat it as your primary set. Check your local authority's rules on licensing and registering VHF equipment before you buy and transmit.
Before you head out, the B7R app gives you sea state and tides for Shuaikh and Shuaiba ports, plus a fish guide, catch log, seasons and marine tools, so your float plan sits on real data instead of guesswork. It is free on Google Play.
Charged radio, channel 16 known, script memorised. Get the app here: B7R on Google Play.