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From: rbowman <bowman@montana.com>
Newsgroups: comp.os.linux.misc
Subject: Re: FAA To Finally Ditch Floppy Disks & Win-95
Date: 23 Jun 2025 05:52:50 GMT
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On Mon, 23 Jun 2025 02:25:45 -0000 (UTC), Lawrence D'Oliveiro wrote:

> On Sun, 22 Jun 2025 21:55:47 GMT, Charlie Gibbs wrote:
> 
>> Decimal degrees do make number crunching a lot easier.
> 
> Trig calculations are most easily done in radians.

And getting to radians is a hell of a lot easier without having to beat 
degrees, minutes, and decimal seconds into a usable variable.
> 
>>> If you want to have real fun with your Garmin set the datum to NAD27.
>>> When he first started a geocacher was using that instead of WGS 84.
>>> The coordinates were about 100 yards away, which is fun when you're
>>> looking for a hidden ammo can on the side of a mountain.
> 
> That 100 yards sounds about right for the distance between Greenwich
> Observatory and the current location of the 0° longitude line ...

https://www.australiangeographic.com.au/science-environment/2017/02/how-
gps-keeps-up-with-australias-continental-drift

I assume NZ is drifting around like an unmoored kayak too :)


I don't know about GDA2020 but I think NGS 2022 got derailed by Covid 2020 
and died a quiet death.

https://ctgis.uconn.edu/wp-content/uploads/sites/2163/2018/05
/Datum_Changes_CT_GIS.pdf


6 or 7 years ago that was on my plate as a potential future problem since 
we dealt with the Department of Interior. Like all good things I 
procrastinated until the problem went away.

https://www.esri.com/about/newsroom/arcuser/moving-from-static-spatial-
reference-systems-in-2022