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Old 07-08-2019, 08:52 PM
Melbourne is offline
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Join Date: Nov 2009
Posts: 5,189
Galileo and BeiDou are basically economic programs for local industry. GLONASS is older, and technically different. and dual-receivers gave you something you couldn't get from either GLONASS or GPS individually: GLONASS was accurate, but often not in sight: GSM was in sight, but not very accurate.