[OZAPRS] APRS Short Standard

[Andrew Rich]

> Just experimenting with a few ideas for storing location info into a
memory
> stick and short APRS pos TX
>
> 1. example 2734.45S15306.22E
> 2. Strip off dec point - you know the last two in are where the dec
point
> goes
> 3. 273445S1530622E
> 4. each number is going to be 0-9 that requires 4 bits
> 5. you can stuff two digits into one 8 bit number and split at rx end
> 6. 2 = 0010 7=0111 3=0011 4=0100 4=0100 5=0101 1=0001 5=0101 3=0011
0=0000
> 6=0110 2=0010 2=0010
> 7. That makes 13 x nibbles, you need 14xnibble to make up 7 bytes.
> 8. Use the last nibble to store S/N E/W eg 0100 = NW 0000=SE 1100=NW
1000=
> NE
>
> At the receiver
>
> 00100111 00110100 01000101 00010101 00110000 01100010 0010 0000
> 2      7       3      4       4      5       1      5       3      0
6
> 2       2      SE
>
> Go in 4, add a dec point, go in 2. add the N/S bit, go in 3, add dec, go
in
> 2, add E/W
>
> 2734.45S15306.20E
>
> Ideas ?
>
> This seems to fit.
>
>
>
>
>

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