Option Provides RTCM Message Output
Differential GPS/GNSS (D-GPS or D-GNSS) is a technique to improve location accuracy of a receiver to centimeter levels by using data from a nearby reference station. The reference station is a surveyed location that calculates the offset from the satellite signals' calculation and the actual position. The Radio Technical Commission for Maritime Services (RTCM) provides the correction message from the reference station. This differential technique is also used in real-time kinematic (RTK) navigation systems.