A piece of communications gadgetry even mentioning checksums is like a car salesman proudly claiming "... and this baby comes with working brakes!" The very pronouncement leads to worry, and additional questions (like this very thread, QED :-) ).
My inexpert digging came up with: They use APRS packets, which use AX.25, whose framing includes a 16-bit Frame Check Sequence, which looks like it came from HDLC, and is a 16-bit CRC-CCITT. Phew.
My inexpert digging came up with: They use APRS packets, which use AX.25, whose framing includes a 16-bit Frame Check Sequence, which looks like it came from HDLC, and is a 16-bit CRC-CCITT. Phew.