Tests of Decimeter-level, Differential GPS Navigation a Long Distance Away from any Reference Station, with Implications for Very Accurate Positioning at Sea

The accuracy of post-processed, differential, carrier-phase based, GPS navigation has been tested over very long baselines, in two occasions. In the first test, which is first reported here, there was a receiver on a rotating turntable; in the second test, the moving receiver was on a boat. In this paper the earlier and the new results are presented to a wider audience of potential GPS users, who may benefit from the knowledge that, over distances of up to 1100 km from the closest reference station, decimeter-level navigation is feasible. These results have clear implications for the scientific exploration by remote sensing of large areas of the world, such as the oceans.