I was systems engineer for TI when they made both aircraft and marine LORAN sets. If you remember, Texas Instruments was the first to qualify LORAN for aircraft.........
Aircraft sets are more expensive since they have a number of features that are automatic, with the assumption that the aircraft pilot has enough to do and doesn't need to look up stuff in manuals or press buttons..... Aircraft LORAN sets, from any manufacturer are much better....
If you have an aircraft LORAN, it will normally be very good in a boat.
Boats, which sail in small areas, have fixed tuned filters in the receiver to reject interference that messes up the signal. They are normally tuned by the dealer/shop before sale, to that particular ares, such as San Francisco, or New York harbor.... etc.
Aircraft LORAN assume that the plane will be flying over larger distances and will tune in and tune out many many many interferers during a flight. The filters are automatic, ----- that's the way I did them in the TI LORAN...
So go ahead and give it a shot in your boat.... You will be way ahead of the game, normally.
But, one of the posters is absolutely correct. LORAN is obsolete compared to GPS.
Even the cheapest GPS available ( I got one from WalMart for $75 last year), will do circles around a LORAN for accuracy, speed of calculation, cost, power consumed, and anything else you can name....
My personal opinion is that your LORAN set should be made into a nice lamp, to leave to your grandchildren.
Andy (retired electronics design engineer )