COORDINATE ERROR CONTOUR FOR SHIP’S GPS RESEIVER GP-37 IN THE VICINITY OF SEA-BASED PLATFORMS AND INSTALLATIONS
We studied precision of ship's GPS receiver at the latitude of the city of Vladivostok when a raised sea-based platform or installation creates an obstacle to reception of GPS satellite signals from the North-West direction. Under these conditions, the range of variations in the ship's GPS coordinates reaches 980 meters. The root mean square error for latitude and longitude coordinates increases 14 times, reaching ± 23 meters. The obtained planar contour of coordinate error distribution is significantly elongated toward the obstacles to the satellite signals. For an accidents-free ship navigation in the safety zones we proposed to equip sea-based platforms and installations with specialized local high-precision radio-navigation systems.