I have a handheld and do use it. Still...
- doesn't address hearing Channel 16 broadcasts over the music, and
- with a handheld turned on all the time for monitoring, remembering to recharge/replace batteries is now yet another item on the checklist.
Years ago I picked up a very cheap gizmo for my answering machine that switched it off when an extension telephone was picked up. You'd think the radio industry would come up with a similar device.
And, yes, I've checked Radio Shack and a mail-order marine-audio shop with no joy.