[aprssig] UNPROTO 6 character alpha-numeric ?

[Stephen H. Smith]

nc8q-1 wrote on 10/14/2004, 10:27 AM:

 > What is the significance of the 6 character UNPROTO
 > string?
 >
 > example:                     vvvvvv
 > 2004-10-11 14:50:37 KC8KEY-1>S9RS9U,W8MWO,KC8QBL-3* <UI R>:
 >
 > Best regards, Chuck

This is a Mic-E compressed-format packet that codes part of the lat/long 
position information into the destination field to create the shortest 
possible packet burst.

Since APRS operates in unconnected mode, you normally never address a 
specific station. The destination address is basically overhead, and can 
be "stolen" to code other information.