Ross, not 100% true. VHF is very resilient range wise. As long as one has an open path (line of sight) one can talk. I use 2 watts on my boat, handheld ham rig, to talk to a repeater 53 miles away on an island. So it can be done, however, one has to be realistic and try and keep the antenna as high as possible. If Slowdog keeps his antenna on the mast and runs his cable to the cockpit, he should do well range wise. It would be the same as using a fixed radio on low power.
Just as a little bit of trivia, Amateur Satellite uses UHF (400 MHz) to talk from the earth to the satellite, and VHF (150 MHz) to talk from the satellite to the earth. This is a distance of about 1000 KM (621 miles). The caveat is the antennas on the satellite are a little better than handheld antennas, but I have worked the satellites with the same handheld antenna I use when I am on the boat. Again, just an FYI. It can be done.