Receiver dependability is improved by fault detection using five satellites, i.e., Receiver Autonomous Integrity Monitoring (RAIM). The GP-90 indicates the integrity status in Safe, Caution, or Unsafe label. These indications are given with respect to user selected accuracy level, 10 m or 100 m. RAIM also works on DGPS signals. A choice of display mode is available from VideoPlotter, Text, Highway, etc. In the highway mode, you can intuitively see how to steer and where the next waypoint is located relative to your ship. It is useful when you are following a series of waypoints along a planned route. WAAS is standard fitted to improve the position accuracy and DGPS is optionally available with an internal or external differential receiver. Receiver dependability is improved by fault detection using five satellites, i.e., Receiver Autonomous Integrity Monitoring (RAIM). The GP-90 indicates the integrity status in Safe, Caution, or Unsafe label. These indications are given with respect to user selected accuracy level, 10 m or 100 m. RAIM also works on DGPS signals. A choice of display mode is available from VideoPlotter, Text, Highway, etc. In the highway mode, you can intuitively see how to steer and where the next waypoint is located relative to your ship. It is useful when you are following a series of waypoints along a planned route. WAAS is standard fitted to improve the position accuracy and DGPS is optionally available with an internal or external differential receiver. The GP-90 consists of an antenna unit and display unit. The display unit is a 6" silver bright LCD offering optimum viewing under the direct sunlight. Dual configuration with a second system provides a backup or remote operation to ensure system availability.