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ck2today at 7:30 PM4 repliesview on HN

not just space weather, I am pretty sure the atmosphere is being disturbed by toxic human activity both by accident and on purpose

I've run outside every morning for decades and used Garmin with GPS since 2015, I've never had so much trouble

Garmins finally supports dual-band (L1+L5) and BeiDou on newest models but it's still not enough to compensate, I have to use a Stryd footpod to guarantee accurate distances/speed

btw BeiDou GPS blows away US GPS for number of sats and precision but despite Russia's GPS being legal in US, technically BeiDou is not

* https://warontherocks.com/a-signal-point-of-failure-integrat...

* https://payloadspace.com/gps-faces-growing-competition-from-...

* https://en.wikipedia.org/wiki/BeiDou#GPS_vs._BeiDou_Capabili...


Replies

arijuntoday at 8:34 PM

> BeiDou GPS blows away US GPS for number of sats and precision

Both BeiDou and GPS are supposed to be limited to 10m precision for civilians.

But, going down a rabbit hole, I found that BeiDou is way more accurate than 10m--3.6m and 2.6m outside and inside the Asia-Pacific region, respectively [1]. And that's with the most simple algorithm. It goes down to ~2.5m using dual-frequencies to account for atmospheric error.

[1] https://www.nature.com/articles/s41598-022-12012-y

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z2today at 7:45 PM

For resiliency reasons alone, it's been proposed to allow (stop software-disabling) BeiDou in the US, but the last time this was brought up, the administration ran out of time. It's a shame, because when there is precise coverage, it enables things like lane-level city navigation.

https://warontherocks.com/a-signal-point-of-failure-integrat...

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arijuntoday at 8:55 PM

It seems that all the device manufacturers (they mention Apple, Samsung, and Google) are using BeiDou anyway. I don't know if that includes Garmin watches, though.

https://www.reuters.com/technology/us-agency-probes-risks-fo...

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