[aprssig] APRStt for SAR using UTM grid!
esarfl at gmail.com
Thu May 16 13:48:06 EDT 2013
On Thu, May 16, 2013 at 6:18 AM, Greg Higgins <gs.higgins at sbcglobal.net> wrote:
> FYI...after Katrina (28 May 2009), the DHS / FEMA and rescue community
> established the US National Grid (USNG) as the common coordinate system. You
> would be better off adapting that than the UTM.
Most SAR teams I have interacted with do not report the zone, only
XXXYYY or XXXXYYYY. In this case USNG and UTM are identical* (in the
spec you linked, see Annex B, Table 1, page 17). There's no need to
"adapt to that" as you suggest; Bob's proposal already supports USNG.
If you want to be pedantic about it, UTM doesn't officially support
truncation, so in fact Bob is conforming to the USNG spec here but not
* Assumes use of WGS84 with UTM, which I assume was implied when used with APRS.
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