Use the Glass. I am about to re-do using glass. My magnets continue to either rust, pull-out, or both. I still believe that magnets are the way to go (especially since I use a GPS not a compass) but glass seems to be a must.

This summer after a full day of paddling, I couldn't get my front hatch open due to the magnets rusting together. Had to use prying force leading to some minor wood/glass damage and pulling 3 magnets out of their homes. I am planning to build a Night Heron this winter and there is no doubt that I will glass over the magnets.

Hope this is helpful.

B