In
Colombia you can call the Coast Guard or the
Navy on
VHF channel 16 and they are often within
radio range, especially the
navy. They have a big presence in both
Cartagena and Providencia, and we found them to be very helpful and professional. In Panama I don't believe you would reach any official
rescue service on the
radio over most of the coast--at least when I was there I never saw or heard of a Panamanian navy or coast guard
boat. Certainly in the San Blas you are basically on your own other than fellow cruisers, and they will be monitoring the
VHF and often get involved in rescues of various sorts. If I was
offshore I would try contacting the US Coast Guard via
SSB first and have them contact some local authorities. I suspect nearish
Colombia the navy might be able to help you
offshore, but more than likely there will be a USCG vessel or two around--they lurk around in waters where drugs might be found. I heard them on the radio looking for someone up around the cape between
Honduras and
Nicaragua.