On a trip through Cornwall, Ontario last month. I decided to unlimber the radar detector I had been hiding since I had gone into Quebec. I thought QC was a no-no for detectors, but was hoping Ontario was OK with them. WRONG! To make a long story short:
A nice Ontario trooper pulled me over and the first thing he said was "Give me your radar detector". After that, he was kind enough to write me a ticket for $170.00 bucks, payable via Email, of course, along with a $2.50 handling fee.

CONCERNING YOUR GPS: Nextar supplies most of the GPS mnftr's their maps and for that reason, I chose NEXTAR. I now have one of their 3-1/2" versions and two of their 4.3" versions and have just purchased their new Snap-5, 5" version. They are simple to operate and do everything I expect them to do.
FYI, my father was born in QC of Loyalist stock, and I have been thinking of building a house on some land we still own up there. Cheers.