All's well that ends well.

But what concerns me is the statement that they could not see him, only hear him. I have no experience in that area, so excuse "uninformed" questions about what could have made him and his family more visible:

1. smokey fire? smoke/flame; also might have helped with warmth and keep the bugs away. (I realize they were in a boat, but it sounds like there trees around, so maybe some land?)

2. Cellphone and GPS? How much, if any, of the area is covered by cell phone service?

3. Sounds like another instance of a PLB being useful.

But, on the whole, he kept his head and made the best of it. A cold night out and some mosquito bites seems the only damage.

I have a four7s light that can be set to flash (and flash SOS); something like this might have helped also. . .