TF wrote

I'm looking for some cross-jurisdiction references relating to
regulations/laws for carrying firearms on a boat across coastal state US
lines. Any links etc would be appreciated.

If you consider that a boat is a residence, I think you can keep arms
aboard anywhere in the US. If you want to be sure, call the US Coast
Guard.

I've never heard of Coasties taking firearms from lawful owners.
However, if you wanted to bring a handgun, it would be good to have at
least one CCW permit. I'd recommend a gun Florida permit if you can't
get one in your home port state.

If you just carry the shotgun, I don't think you need any permit.

You might want to get the line-launcher attachment for the Mossberg
shotgun. I think a dual purpose safety device like that makes sense
for fishing.

Visit www.packing.org for more information.

Bart Senior