this post was submitted on 29 Aug 2026
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Variation up to a full nautical mile doesn't seem very accurate?
The only thing I can think is that they're comparing with a single system (e.g. GPS or BeiDou), even though GNSS receivers will combine all four systems to get very high accuracy (a few metres).
20 years ago we had only GPS, and it already was accurate to 10 or 20 meters.
Is that true globally? I seem to remember that some ocean areas wouldn't have as many satellites visible as e.g. polar orbits don't visit all of the globe.