Love mine. Any of the major brands are fine. Mine is hooked up to the auto-pilot and allows me to leaf through charts, tie hooks, etc. while I keep a look out. As long as you've made sure that there are no islands in the way, mine will steer to five waypoints hands off.

Great for logging in bites, observed bottom structure as well as a safety feature.

Remember though that unless you have a DGPS, they are only accurate to a "neighborhood" figure.

John