I'd like some opinions on using a GPS to check to see if the anchor is set. After lowering the anchor, backing toward shore as rode is let out, then tying off to the cleat, I put the boat in reverse to see if the anchor is set. As the boat's in reverse, I'll look at the water (either something floating in the water, or maybe I'll just spit into the water) to see if the boat moves in relation to it. If not, then I know the anchor isn't dragging. I'll also watch the rode to see if it's steady or if it vibrates, and if it get tight, then slack, tight, then slack, etc. I know of others who look at their GPS as they are backing down to tell them if they're moving. What do you do, and what do you think about the GPS method?