Re: FAA To Finally Ditch Floppy Disks & Win-95

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