GPS useful tool
I use GPS to fix my position at night and then constantly check against what I can see. For example, if the GPS says I should be approaching a flasher I locate that flasher and lock on to it visually until I can locate my next point of reference. If my visibility is compromised the first thing to go is SLOW DOWN! probably to headway speed until I can obtain another visual fix.
In essence, when traveling at significant speed I can always see my next visual marker AND I can always confirm my position on GPS. If I lose confidence in either I slow down until I am confident in both again. I also use a general compass heading as confirmation. I know that heading home is generally a N heading and check that every now and then as well.
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