This GPS unit came out of a boat and worked well while it was installed. It has a 10 channel GPS receiver with a large range of electronic and navigation aids. It can store up to 500 waypoints and 25 routes with up to 50 legs. The package comes with the NAV6500 receiver, remote antenna, power and data cable, mount and cover. A slot excepts a memory card which is included but has not been updated. The manual shows signs of wear but is fully readable. The manual also contains a tutorial which allows the user to practice. The unit can be set to output GPS data in the NMEA format to interface with other devices or equipment, such as a VHF marine radio using DSC, a emergency location transmission showing a ships GPS position to a rescuing agency.