263.675 CONUS: Bull 12 calling any station for a radio check.
Your search for 263.675 returned the following results.
USCG HC-130 aircraft “Zeal 01” calling “Zeal 04” on 401 net. In SoCal you can often hear these guys on COTHEN and VHF/UHF (MCS, CG 127, Blue 3 etc.)
Tags: 401 net, coast guard, CONUS
Coast Guard 2306 requesting a radio check from anyone, but no response is heard.
Tags: 401 net, coast guard, CONUS
Coast Guard 2707 calling JIATF South for a radio check.
Tags: 401 net, coast guard, CONUS
US Coast Guard Cutter Escanaba (WMEC 907) calling JIATF South and D11 multiple times. Station comes up again as Tiburon 907, which appears to be a callsign used for Operation Martillo related activities.
Tags: 401 net, coast guard
District 11 calling Sherlock 24 for updated on scene time.
District 11 calling JIATF South for a radio check in clear voice.
263.675 ATC Mobile (USCG Aviation Training Center, Mobile Alabama) calling COMMCOM (USCG Communications Command) for a radio check.
Tags: 401 net, coast guard, CONUS