That's why I asked the question. Limped back to shore in soup, no stew like fog with my GPS. Had I not had it or had a power failure to the GPS unit bad things could have happened, like slamming into the sheer rock face on each side of the harbour with no where to beach the boat. Anchoring in a Great Lake shipping lane wasn't an option to wait out the fog.
Radar.....lol
A compass is useless unless you know where you are (approx) and where you need to be.
My first real navigational challenge found me 25 miles from the barn, low on fuel with less than an hour of daylight left.
I was working a school of Stripers moving south with a group of charter boats in November. Preoccupied with catching fish, I lost sight of the Charters and visibility was down to less than a 1/2 mile. Worst yet, I didn't have a clue where I was. I was somewhere on the eastern edge of the shipping channel (10 to 15 miles from either shore) and that was about it. I literally didn't know what State (Maryland or Virginia) I was in.
Just short of panic, I broke out the binoculars and spotted a buoy a couple of miles away. Ran over to get the number off of it. I was in Virginia... real panic now. Not enough time and gas to head East and follow the coast back to the inlet. I only had one shot at getting back before it got dark and I ran out of fuel. Broke out the chart book and a ruler to come up with a course heading. My $8 stick-on compass didn't give me high hopes to say the least...
Long story short, I missed the inlet by less than a 1/4 mile from 25 miles out. Cold, dark and almost out of fuel but I made it back to the dock. The next day I went out and bought a Magellan GPS 2000 hand held. Crazy expensive at the time but the experience opened my eyes to how easy it is to get lost in your own back yard.
Today, I have a Ritchie Navigator compass, two chart plotters (one with radar) and a hand held (my old Magellan) to compliment my chart book. With all this, I still steer compass headings. Use the chart plotter(s) for course headings and location feedback only.