comdtinst m2400.1f - US Coast Guard Response Boat-Medium

B. Aeronautical Radiobeacons. The band 190-435 kHz is available
for aeronautical radionavigation and mobile communications. The
bands 190-275 kHz and 335-405 kHz are allocated exclusively to the
aeronautical service. The band 285-325 is also assigned to the
aeronautical service on a non-interference-to-marine-services basis.
The band 405-435 kHz is shared with the maritime service.
Aeronautical beacons operated by the Coast Guard, which are not also
used for marine navigation and therefore not listed in DMAHTC PUB
117, or listed in Aeronautical Enroute Supplements and Flight
Information Publications are contained in Annex N.