freebeer
turn on EGNOS/WAAS.
That can get your accuracy corrected to within 2 metres.
Assuming your visible constellation is well-distributed across the sky.
Go outside if only three or four birds are detected inside.
Get a device capable of receiving additional satellites (glonass, galileo) to have more to work with.
check if updated Bing imagery for your area shows a significant offset from, oh, USGS is usually pretty good.  See if someone realigned everything to bad imagery.
move.  submit to the Rise of the Machines.  they know what is best for you.
