VHF marine FM channel spacing
12.5 kHz channel spacing is permitted in certain cases by the FCC in VHF marine radio. Despite experiments demonstrating the practicality of using 12.5 kHz channel spacing on VHF marine radio, currently available radios and practice appear to remain at +/- 5 kHz deviation and 25 kHz channel spacing. Unlike the vocal controversy around 1969 over narrowbanding VHF marine radio from +/- 15 kHz deviation to +/- 5 kHz deviation, there appears to be little controversy over channel spacing.