If you would consider the ICOM M802, I would suggest getting the ICOM M700Pro marine SSB
and an all band ham rig, such as the Yaesu FT-857D.
Bill mentioned this above, but to reiterate, some cheap
ham radios can have poor frequency stability and bleed over onto the next SSB
channel. This is incredibly annoying to others using the SSB bands.
But...more than that....once you begin using marine and ham radios, I think you will find you never want to be without. So, having a back up is a great idea.
By getting the M700Pro, you have a 150W radio, vs a 100W ham rig. It has excellent rx and tx characteristics and a very nice low noise
floor. It can make the difference in long DX contacts.
Getting an all band ham rig such as the Icom 706, Yaesu 857, gives you access to VHF
and UHF bands that you can use with local repeaters and Echolink. This is a great advantage...especially if you sail through the FL keys were the 2m repeaters are linked. We have been going through a pretty bad space weather
period and so using VHF
and UHF ham bands has been a relief.
For less than the price
of a new M802, you could easily buy a new 700Pro and a good used all band ham rig.
One last comment: get a REALLY good tuner. The SGC-230. It is well worth it.
Hope this helps