An island is not much of impediment to VHF reception if you have a full power dash mounted unit and a decent antenna.
Also, many of the resorts and emergency services have antennas mounted on towers, so they can reach the whole lake. I had no issues talking to the Ebols base on the Ash River from the Wolf Pack Islands, I was getting perfect reception and I herd Ebols talking to a boat up by Kettle Falls.
It is also possible to “relay” messages.
Bottom line is there are enough radios in action in that area and the cell phone reception is not 100%, so I wouldn’t be without one out there.
Also, call me old school, but I like the weather channel. It’s quick, it’s easy, hit a button you get the forecast.
Just as a note, you may be tempted to go with a handheld. The range is nowhere near that of a full power dash unit. We used a handheld for houseboat to fishing boat communication when scouting caming sites, but they would not be a good choice for a primary radio.
BTW, I had Sprint cell service last summer and had ZERO coverage on Kab and Nam. Only place in MN I can recall having no coverage where Verizon and ATT have coverage. No idea why this was.
Grouse