In open sea, dingy will capsize..
Scoopdreams.. warship is the term used for a specific class of military vessel. our Navy ships are called gunboats or patrol craft in Navy standard. US coast guard's ship is bigger than ours.
Depending on which US Coast Guard assets you're referring to...
The US Coast Guard has a fleet of vessels with the capabilities of a blue water Navy. I don't think RSN is blue water capable. Resupplying is gonna be a headache.