Sea vessel goes down.
This is a hypothetical obviously because if I was on a sailing vessel, on my phone and stranded. I shouldn't be stranded..
Okay Sat phone or GPS locater has been washed away and I have part of a water craft.
Other than finding something to keep you afloat.
What do you do first.
In warmer climates I am thinking I would build a still for water. In colder climates warmth first.