The devil is in the details, as always. For most of us this isn’t an issue, as we would have our VHF radio linked to GPS. In an emergency, you push the Distress button and it automatically sends out a distress, notification to all mariners and coast guard with a shrill alarm. This broadcast provides vessel details and location to rescue agencies. All VHF radios now sold have this feature. This, together with AIS, and an EPIRB and coast guard will have no difficulty In locating you. However there are always a few situations where the VHF radio isn’t properly installed. Then you have a problem. HUFF-DUFF as it was colloquially known is short for High Frequency Direction Finding, where ground stations are used to triangulate into radio signals. During WWII it was used with moderate success to locate and assist aircraft to a safe landing field in low visibility situations. The pilot was provided a bearing with which to fly.
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