What is the maximum allowable frequency deviation for VHF marine radios?

The maximum allowable frequency deviation for VHF marine radios is indeed +/- 5 kHz. This deviation is specified to ensure that the transmitted signals remain within acceptable limits to minimize interference with adjacent channels. In marine communication, clarity and reliability are crucial, especially in emergency situations, so adhering to this frequency deviation limit helps maintain effective communication without causing overlap with other channels that could lead to confusion or signal interference. The marine VHF channels are spaced 25 kHz apart, so limiting the deviation to +/- 5 kHz ensures that each transmission stays centered on its designated frequency without encroaching on adjacent frequencies. This standard promotes safe and efficient maritime communication.