The Differential Global Positioning System: A Complete OverView - The Salem Land Survey Institute
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The Differential Global Positioning System: A Complete OverView

The Differential Global Positional System Positioning System service transmits the correction signals to GPS navigation equipment onboard vessels. This service will enhance the accuracy of the GPS position along with the quality of the signal. It is highly important to make a note that the service will improve the accuracy of position data only. It will not affect the results based on the speed data like the brake stop results. Continue reading to find the overview of the device and its operations.


It is one of the crucial factors that the range of the DGPS station is the signal strength and the signal to noise ratio. Signal strength or the signal-to-noise ratio will be too low, and it will lead to loss of the transmitted data. If lots of subsequent messages are lost, the DGPS corrections will gradually become older and result in the positioning accuracy and lead to gradually poorer. The receiving equipment will switch to the GPS-only model and ignore the DGPS corrections. Receiver equipment

The user should be equipped with the proper DGPS radio beacon receiver to use the corrections from these devices. In certain receivers, both the GPD and the DGPS receivers will be built within the same unit. There are also certain receivers with the combined GPS and DGPS antenna. The user equipment should be earthed property with the aim to reduce the sensitivity to noise. Here, the user should note that not all these receivers will have the necessary functionality to display integrity alarms for the GDPS System.

DGPS station

Every DGPS station will have two reference stations with some unique ID numbers. One of the references stations will be active, and it will be connected to the radio transmitter. On the other hand, the other reference station is the reserve. The user equipment will display the ID number of the active reference stations. The stations broadcast DGPS in accordance with the international standard recommendation.

Nautical charts and GPD or DGPS

The geodetic datum used by GPD is considered as the World Geodetic System. Also, the datum used for the calculation of DGPS corrections. Several Norwegian nautical charts will be issues with the WGS-84 datum, but there are also some charts issues with this ED50 datum or with the Norwegian graticule. When you are using the charts with the datum other than WGS-84, the position should be converted before it enters into the cart. It is normal practice for the conversion value to be noted on the cart.

The bottom line

Thus, you might have got a complete overview of the Differential Global Positioning System. Learn more about it to make use of it in the right way to enjoy complete benefits.

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