CHIRP

This radio is common in the boating community, many use it for sailmail while on board https://sailmail.com/about/

And here: https://en.wikipedia.org/wiki/Sailmail
Furthermore, many hams have rigs on the boat, at least some of the time.
I am one of them !!
Please re-consider the ICOM IC-M802 !! (2mhz - 26mhz)
From Icom: http://www.icomamerica.com/en/products/marine/ssb/m802/default.aspx
M802 has 160 user programmable marine channels in addition to the ITU channels. (about 1,000 ITU plus the 160 user channels)
These user channels can be reprogrammed by you, the user!!

I have a radio and will assemble a cable, I am sure Icom used a known memory format, right?
Channels 129-160 are HAM radio channels !!

It should only take a week or so, right?

DE KB9UKM
Tyler
Sailing Vessel Bolero 60 foot custom ketch.