[time-nuts] GPS coordinate differences between APRS.FI and Google Maps

Bob kb8tq kb8tq at n1k.org
Fri Apr 20 19:08:30 EDT 2018


In general the N/S E/W part of the location should be pretty good between various 
reporting systems. Altitude … maybe not so much. These days, whatever GPS reports
as “location” generally is considered to be correct. Anybody using a different set of 
numbers is expected to translate over to the GPS datum. 

Various maps over the years have been surprisingly far off from reality. There are a number
of wonderful stories as a result. In addition, there are (as mentioned in other posts) a 
variety of datum’s you might use for a map. Google Maps is a lot closer to GPS today
than it once was ….


> On Apr 20, 2018, at 5:20 PM, Russ Ramirez <russ.ramirez at gmail.com> wrote:
> This has probably been mentioned before, but there is a significant
> discrepancy between APRS.FI locations for DMR hotspots for example, and
> what my Trimble receiver and Google Maps says when I use my address to
> lookup the coordinates.
> On APRS.FI my location has to be 45.15 N, -93.39 W for the icon to be in
> the right location on the map.
> On regular Google Maps, my QTH is correct and matches what my Trimble says
> via Lady Heather within a few seconds. 45.2586 N, -93.6554 W.
> Do any of you know what causes this, and did I do anything wrong possibly?
> Russ
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