There may still be confusion. Did you ask your liveaboard if they had a VHF radio, or only if they had DSC or AIS? "Marine" radio means too many different things.Ah, thank for the info! I guess that clarifies the meaning of "marine radio". Now, what to do...?
Here's an alternative: you can get a cheap marine VHF radio and give it to the boat to listen for your emergency voice call (in Gen 1 Nautilus), then leave it with them as a tip.