[aprssig] APRStt for SAR using UTM grid!

Tom Hayward esarfl at gmail.com
Mon Jun 17 09:47:45 CDT 2013

On Sun, Jun 16, 2013 at 6:22 AM, John Langner WB2OSZ <wb2osz at comcast.net> wrote:
> Here is another APRStt implementation which includes processing of UTM
> coordinates.
> http://home.comcast.net/~wb2osz/Version%200.7/APRStt-Implementation-Notes.pd
> f
> DTMF decoding is done in software so no special hardware is required.

This is a good start, but you've implemented a non-standard UTM
truncation system:

> The xxx and yyy ranges would extend over a 10 x 10 km area with 10 meter resolution.

Typical UTM truncation (as in the MGRS and USNG spec) is an order of
magnitude higher, so xxxyyy extends over a 100km x 100km area with 100
meter resolution. To add resolution, add a 10m digit to give you
xxxxyyyy format.


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