[aprssig] Error checking within APRS packets

[Max Harper]

What type of error checking does APRS have to prevent corrupt data? 
 
There is an Igate in my area that changes the callsign of some of the packets that it gates. The Igate is KG4NVN-13 and I notified him a few days ago about it via email and was told that he would take it off line to check it out. I don't know if anything has been done to try and fix it, but it's still changing the call sign of some of the Igated packets. He is running UI-View and a D-700.
Of the packets that I have looked at, it always seems to be just the call sign that has letters changed, the rest of the packet looked OK.
 
Thanks Max KG4PID
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