I sail all over the Chesapeake Bay. Most is line of site but I'm usually solo so I do like to know, with a fair amount of certainty, where I am. A year ago, I could see little value in using a GPS. Now I use it almost 100% of the time. With the exception of one incident, it has been very reliable accurate. Most of my use is going up small creeks and anchoring. I use it for reducing distance going around points of land and their shoals. I learned that there is a limit to how close you can cut by running aground fairly hard (onto sand) entering the Chester river in a 20 knot w wind. Fortunatly I was able to sail off but that 40 minutes of pounding was a little hard on the nerves. Still, I'm amazed at the accuracy.
Islander 30 Bahama