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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: RE: Re: Difference between GPS and measured distace.
Date: Sun, 28 Jul 2024 14:22:10 -0500
Organization: Yellow Jersey, Ltd.
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On 7/28/2024 2:04 PM, Tom Kunich wrote:
> On Sun Jul 28 17:57:01 2024 Roger Merriman  wrote:
>> Tom Kunich <cyclintom@yahoo.com> wrote:
>>> T have been doing a route past the airport and back that has pretty large
>>> variations in distance on the Garmin but mostly 25 miles. Yesterday I
>>> installed a wheel sensor on the bike and added it to the sensor group.
>>> The 25 mile route came in at 27 miles. Now upon occasion it showed that
>>> distance on straight GPS but it appears that civilian GPS is pretty easy to interfere with.
>>>
>> You?ve done something wrong to be getting that degree of inaccuracy. If
>> it?s GPS drift is possible to map that.
>>
>> I use GPS only, but even so very minimal deviations certainly not into
>> miles or kilometres!
>>
>> Roger Merriman
>>
> 
> 
> 
> This only occurs around the airport and not up in the hills. So I think that it is due to radio interference.

or perhaps:
https://spectrum.ieee.org/faa-files-reveal-a-surprising-threat-to-airline-safety-the-us-militarys-gps-tests

https://www.gps.gov/spectrum/

https://arstechnica.com/information-technology/2022/10/cause-is-unknown-for-mysterious-gps-outage-that-rerouted-texas-air-traffic/

Nice phrase in that one, "experiencing GPS anomalies".  Just 
like you!


-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971