Re: VHF Protocol
I used to talk on radios as part of my daily job (military aircraft,) and on top of all the various formats and procedures was the requirement to COMMUNICATE. I've seen people stammer and sweat trying to use a particular format, when they could just use plain English to pass the necessary information.
In an emergency, if I was not able to recall the proper format for a mayday, I would take care to include in my first transmission my identification (any ID suitable for establishing a back-and-forth conversation,) location (using landmarks, plus lat and long if available,) and nature of emergency. If I was in extremis I would add the number of people aboard.