Join Date: Mar 2006
Location: New England
Thanked 17 Times in 13 Posts
Rep Power: 15
The real problem is that radar detectors do not warn you of boats approaching, unless they have their radar ON. What might be a better choice, is a radar signal enhancer... they do make these for marine use. The device basically takes the incoming radar signal and amplifies before re-transmitting it. This makes you show up on any nearby radar fairly well.
I'm really surprised that your radar unit doesn't have a guard zone feature of any sort.