the HF TNC does not transmit a position beacon neither via the
internet nor RF.
You can add a line like this to direwolf.tnc300b.conf to send a
beacon,
PBEACON sendto=IG compress=1 delay=00:15
every=30:00 symbol="igate" overlay=R lat=38.999 long=-120.999
comment=" DigiPi http://digipi.org/"
that will send your position to aprsis/
aprs.fi via internet. remove
the "sendto=IG" to transmit the beacon on RF instead.
if it helps,
-craig
KM6LYW