Check regulations in regard to firearms not only on the water, also any launching sites that fall under "park" regulations.
In large lakes [speedboat] the main concern folks had/have was getting to and fro site, launching boat and the like - and if they stopped on any islands and two legged threats. Concealed is concealed.
Mentors carried Ruger Standard .22 pistols, granted these ladies and gents were most proficient with these. Stopping on a island for a break and any snakes or other threats.
Others carried 1911s and K frames, concealed.
Bass Boats and night fishing, same guns, as often times we camped on the islands. Long guns "can" be more difficult to conceal, have access to, and concerns of theft.
Meaning camp is set up, and one is not wise to leave a gun in camp unsecure, even though most folks were honest and did not mess with another's campsite...most, not all...
Kel-Tec P-11 was tested and is being used for speedboaters, bass fishing, canoes, jonboats and party barges.
Lakes, rivers, reservoirs, bayous, slews and resevior pond and catfish farms (lake).
Being honest, some used nicer guns, like 1911, BHP, Colt and S&W revolvers, just these are nice guns, not made like they were so the P-11 was one, Ruger 22/45 , Ruger P series are two others.
Concealed and on person, these guns worked in fresh and salt water, and just us, we prefer a hammer over striker , especially in "conditions" like water.
Main concern was coming and going with a boat, like pulling over to get ice and snacks, and someone seeing this and thinking "money" or "credit cards" and if you can afford that boat and vehicle, rob one.
Long guns are mostly used on property, and most do not use Marine guns, in our fresh water area. Some catfish farmers do use marine finish, and that has to do with chemicals they handle (feed, algae control...)
Most do not.
Long guns used when doing property duty down the slews and reseviors, snake infested area or coming up on areas dry, where the rabid critters are hiding out.
Off the Mississippi and using barges to ferry vehicles to islands to hunt/ fish, long guns are taken of course, not only for hunting, also modern day pirates and drug running.
On a lake in a speedboat- concealed is concealed.
P-11, Ruger P, Ruger 22/45 and electrical tape to have a lanyard is not a bad idea.
There is a Rolex President and Marine shotgun in the bottom of a large deep body of water.
Things went nuts right before the engine scattered.
The insurance company said, it was not worth sending divers down...
The fellow was real nervous about the folks that towed them back, they kept eyeing his wife...
Both wished they had a handgun on person...nothing happened, but they do carry concealed now...in a speedboat, any boat.