[aprssig] Object Timestamps and 111111

[Bob Bruninga]

> Ok, so that's where the 111111 came from.  
> Is it actually written down somewhere 
> that new APRS implementations can learn about it?.

Should be under aprs.org/aprs12.html

> What about the h format vs the z format,

No, only the 111111z is defined as the NULL field.

> And what does the timestamp actually MEAN? 

That is when it was reported at that position.  For permanent objects or objects transmitted by statios without real-time clocks, you can see why we needed a null value.

Bob