DATUM settings in your GPS can be critical
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Lucent/Symmetricom/Datum RFTG-m-Rb & RFTG-m-XO Rubidium GPS Frequency Standard | eBay
What is Datum in Surveying?
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Datums | Intergovernmental Committee on Surveying and Mapping
DATUM settings in your GPS can be critical
Map Datums
Datums, feet and GNSS vectors: The 2022 NGS upgrade - GPS World
