I don't have
radar or a mounted
gps on my 22 footer yet I keep getting caught in fog now and then... My first
line of defense is keeping a good track on the
charts... Then I listen for buoy bells and boat
horns then sound my horn on required timing...
The times I've got caught on heavy fog on unfamiliar areas, I circle around a buoy in a tight circle, thinking (hoping will be more appropriate) that the bigger boats would avoid passing too close to the buoy…
On the worst case scenario, I try to find a mooring or anchorage area near by to stop and wait until the fog is lifted…