DGPS Services

Several of the GPS receivers available today uses real-time differential solutions typically providing sub-meter to five meter accuracies. This technology allows the use of the Coast Guard radio-navigational beacons and/or satellite differential providers for differential correction. The Coast Guard beacons are used free of charge and are limited to the range of a specific beacon signal. Most Coast Guard stations are currently located along major navigable waterways. Satellite differential services are subject to an annual subscription fee, typically $800/year, but the range is not limited. Performance of the satellite differential system is not going to vary whether you are in Washington today or Florida tomorrow. To Start an Omnistar DGPS Satellite Subscription for your Trimble Products: Contact Elecdata to start your DGPS satellite subscription. Make purchase order to: Electronic Data Solutions. Payment terms are Net 30 days upon approved credit. We also accept VISA and Mastercard. Tech Notes for Activating an Omnistar Subscription on Your Specific Trimble Receiver For more information on Coast Guard DGPS system and coverage areas: Coast Guard DGPS Web Site WAAS The Wide Area Augmentation System (WAAS) has been created by the Federal Aviation Administration (FAA) to augment GPS with additional signals for increasing the reliability, integrity, accuracy and availability of GPS for aviation users in the United States. WAAS consists of a network of 25 ground reference stations and a number of geo-stationary satellites broadcasting a signal in the GPS band. The WAAS signals contain information including differential corrections and GPS satellite health status. A complimentary system called the Local Area Augmentation System (LAAS) has been created to allow GPS to be used for landing airplanes. LAAS is installed at individual airports and is effective over just a short range, with an accuracy better than one meter in all dimensions. The primary WAAS benefit to mapping and agricultural users of GPS is another source of free differential satellite corrections and additional robustness of service with the addition of one or more ranging signals. LAAS will have minimal impact on mapping and agricultural users.