I use a Garmin Camo GPS. This is a handheld unit. The advantage to that is if you use a different boat or go out with a friend you can still locate your brush. I use mine every time I fish.
Most of my 2 lb+ fish that I happen to catch come off of small brushpiles that I construct rather than the more public Corp. of Eng. brushpiles.
When I leave the bank I have a plan as to which brushpiles I will try first and without my GPS this would be impossible.