Power, Aerial, And Range

A fixed VHF commonly combines higher available transmitter output with a higher antenna and the vessel's main electrical supply. A handheld can continue if the fixed installation or main supply is lost, but its low antenna, battery endurance and device-specific waterproofing limit what should be expected from it.

Start nearby routine calls on low power. This reduces unnecessary interference and may be all that is needed. For distress, use the effective available means and do not let a routine low-power habit delay the alert; follow the complete distress procedure taught in the dedicated module.

High power can strengthen the transmitted signal, but it cannot restore a damaged aerial, bad connector, discharged battery, incorrect channel or screened radio path. Diagnose the whole chain and preserve the handheld's charge for the circumstances in which it may be the only working set.