Summary: We tested our Garmin GPS 535s for the first time on our boat during a recent visit to the South Carolina coast. It worked beautifully and showed us all the data we needed for a successful cruise. The unit was purchased to enable us to take our boat into some larger waters. We cruised the Beaufort River and into the Atlantic. Retracing our steps back to port was easy. The Garmin 535 showed us the way.