Automatic Positioning System

To make the results of these methods useful, it is essential to position the surveys with great accuracy. For this reason the use of Global Positioning System (GPS) in differential mode is essential for marine applications. The principle of the method is simple. All DGPS systems use a GPS receiver /computer combination (called a base station) located on a surveyed point. A second station is located at the survey site and is usually moving. Both stations receive positioning information via satellite. The differential mode of operation is a way to improve the accuracy in a localized area. The survey GPS station is interfaced with the geo-physical surveys so a match could be done between position and record number.