Long ago I learned to get from Welch to Glendale in the early morning fog with route on a map, compass and watch timer. Not easy to hold a course at slow speed with no visual reference and keeping look out for other boats etc. One complication is knowing how much the compass is knocked off by use of nav lights and/or wipers.
Now the compass is still one input however the GPS is the main nav aid in fog. It provides confirmation of being on track also the GPS heading read out is not affected by use of boat electrical systems.
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