Weems & Plath just signed an agreement to make and distribute a revolutionary, low-cost and easy-to-use man-overboard system developed by PanPan and called the CrewWatcher. Peter Trogdon, the Weems & Plath president, just demonstrated it to me here at the Annapolis power boat show, and it seems like a no-brainer. The CrewWatcher system is an app-based MOB alarm using a smart phone or tablet with a small beacon that can easily fit in your pocket. It’s all automatic and requires no manual activation. When it’s dropped in the water, the device sounds a loud alarm and then on screen gives…