Global MapSport is a related product with cartography functions. Acquisition times are taken from data sheets and aren't equivalent between manufacturers. They certainly aren't tested and don't mean much. There is an important difference in output port usage between NMEA position reporting and steering output in real time and a one time waypoint download. All have 1 year warranty and backlit LCD displays, battery eliminator option, velocity display, computed Magvar and water resistance.
Battery life is quoted for nonrechargeable alkaline cells.