Another Thumbs up for the ProStart. Used ours for the first time a few weeks back on a race that into the evening dark hours. All modes- daylight, backlit and red light worked great- very visible.
Ran into somethin we had not thought of., and a nice benefit of the device. Very low key race, take your own time event. Was a reverse handicap start. The day prior, we learned in an amendment that the RC would not be on station at the start. The line was a mag heading from a buoy marking one end of the line to a point 0.25 miles away. Was easy to go ping the buoy as one end, then move to a point .25 miles away at the right mag heading and "ping" the other end. No need to worry about a transit or any of that. Relied on the distance to line and made an easy, not over early, start.
Really nice having mag heading instead of GPS heading. One thing I would like is to be able to show both side by side.