Raymarine Tiller pilot linking to GPS

Raymarine st 1000
I have this auto pilot and dont use it very often. Generally put it on
and click it until its going where I want to go
However I have been checking its reading and its always about 10' out
from the GPS course.
Mt main compass also reads different and so does my handbearing
compass. ie 4 compasses but all giving differnt readings.
Is there any way that the tillerpilot can be linked to the Magellan
148 GPS?
Why are the readings out on the compasses - the one tat does seem most
accurate is the GPS
Cheers
Rich
Westerly 2219 DAVICO
.

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