Transmission Range The general rule of thumb, for hand-held VHF radios, is that 1 Watt is approximately 1 nautical mile of range (example: a 5 Watt VHF radio will have an approximate 5 nautical mile range when set to the 5 Watt setting). Most hand-held VHF radios are between 1 Watts and 6 Watts.1 Mar 2019