Four Satellite Constellations for Arrow 100

Four Satellite Constellations for Arrow 100

The submeter Arrow 100 GNSS has the ability to track and use all four available constellations simultaneously!  No upgrade cost required!
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What is PDOP?  And Why it's Obsolete

What is PDOP? And Why it's Obsolete

What is PDOP, HDOP, and VDOP?  What do the values mean? 
This article provides answers to all that and the reasons why GPS/GNSS users should have been ignoring them for a while now.
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