 Each station has 2 NAVTEX transmitters.Besides broadcast messages, Coast Guard stations handle direct traffic between aircraft, cutters, boats, and shore stations on VHF, MF, and HF frequencies, including the HF Data Link encrypted e-mail system and Digital Selective Calling (DSC), which uses radio telephone to send digitally encrypted signals to either one receiver or a group or receivers.The use of the radio spectrum by the U.S. Coast Guard, like all U.S. Government agencies, is assigned by the Department of Commerce's National Telecommunications and Information Administration (NTIA).