[aprssig] APRS LAT/LONG standards

[Lee]

Here's what I use to allow easy and flexible entry of lat/long values:
 Three fields that allow decimal values to be entered; one for degrees, one 
for minutes, and one for seconds. With this setup, those that need/want to 
enter the lat/long using degrees and decimal minutes simply enter the whole 
number degrees in the first field, the decimal degrees in the second field, 
and leave the third empty. If someone needs to enter degrees, minutes, and 
seconds they use all three fields. For someone to enter decimal degrees, 
they just use the first field. 
 All the work validating and converting is handled for the user and there's 
no need for them to perform any conversions. Simple instructions are all 
that is needed.

A similar configuration can be used to display lat/long in different 
formats. This could default to a standard, and still offer the option to 
display in other formats as needed.
 73, Lee K0QED
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