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John - It's my understanding that even with a DGPS receiver (and I don't think you can get a portable hand-held DGPS add-on unit) there's still a margin of error. Maybe not a lot but when you're on the beach on a dark night 20-30 feet can make all the difference in finding the rock or cut or bar etc you want to fish.
Some years ago the LIF ran an article about LORAN in buggies. But I never saw anyone really use it so I don't think it catches on.
If you are going to be driving for miles and miles on an open otherwise featureless sandy beach, then I thinkg a GPS can help get you close to the stop you want. But you'll have to go visual from that point so it's mainly a daytime tool.
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