so ive been running APRS on my D710 for a few months now and mostly its been fine but lately aprs.fi is showing my position like 3-4 miles off from where i actually am. at first i thought maybe i was just looking at an old beacon that hadnt refreshed but ive watched it in real time and the position it plots is consistently wrong, always to the northeast of my actual location.

my GPS is locking fine, i can see the coordinates on the radio display and theyre correct. the radio is set to smart beaconing so its not like its sending stale data. im wondering if maybe one of the digipeaters in my area is doing something weird to the packet? or could it be a TNC timing issue even though im using the internal TNC on the 710?

has anyone seen this kind of consistent offset before? the weird part is its not random, its always the same direction which makes me think its not just noise or a bad decode somewhere.

consistent offset in one direction is almost always a GPS datum issue or the radio is somehow pulling a cached position. the D710 has had some quirks where if the GPS loses lock briefly it'll hold the last known position and keep beaconing it even after reacquiring. try doing a full cold start on the GPS and see if it changes anything. also check what your GPRMC sentence looks like if you can — some guys use APRSISCE or another client on a laptop to sniff the actual packets going out and compare the coords to what the radio display says.

also worth checking if theres a fill-in digi near you running old firmware, ive seen cases where a digi was injecting bad position data but thats pretty rare and usually causes random scatter not a consistent offset.

shot in the dark but is your radio set to WGS84? sounds dumb but ive seen people have issues when something in the chain is using a different datum. probably not the problem but worth a look before you go too deep into the weeds on the digipeater side of things.