U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
The following sections describe the carrier frequencies and general uses of radiotelegraphy and data transmission with respect to the following:
(a) Distress, urgency, safety, call and reply.
(b) Working.
(c) Digital selective calling (DSC).
(d) Narrow-band direct-printing (NB-DP).
(e) Facsimile.
(f) VHF-FM digital small message services (VDSMS).
