The sonar portion is great for me. I just think some work needs to be done on the GPS portion. I can't tell when I'm close to the waypoint or not. May be me, I'll keep playing with it. Some of the commands are not available on all screens so you have to go back to another screen to pull up let's say the scrolling speed, so that you can change it. Then you have to go back to the full screen and see if it's what you want. If not back to the other screen to try and fix it.

The Hound