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To use the IC-2820 on APRS you are going to need an external device to take the GPS data and format it into an APRS data packet, Byonics, Rtrac and ArgentData make devices that will do this. Secondly you need to be with in range of an iGate or a Digipeater that can be heard by an iGate. If the OpenTracker/TinyTracker is configured properly, AND is heard by an iGate, you will show up on APRS.FI.
The IC-2820 cannot, by its self, send APRS packets, it does NOT have that capability.