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Details:The GP1850WD boasts extremely accurate and repeatable position fixes - 10m for basic GPS, 5m or better with DGPS and 3m or better where WAAS service is available. It should be noted that DGPS is currently more reliable and accurate, as the WAAS system is still currently under development. There is no guarantee of accuracy, integrity, continuity or availability of the WAAS signal. For that reason, the GP1850WD runs with DGPS as the default setting in auto selection mode. If the DGPS signal can not be received for any reason, the unit will automatically switch to the WAAS signal. Of course, you can manually set the reception mode as well.
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