Groundstation compass heading mavlink

Hi,

Seems some of mavlink website links are dead at the moment.

Is there a compass heading mavlink message for the ground station?

Now I have a antenna tracker ( with gps and compass) and a groundstation with gps coördinates. When I use groundstation on moving vehicle the tracker follows copter and home coordinates get updated.

Better would be one gps with heading on groundstation wich also updates tracker….

How archieven this ?

Can I give gps and heading from groundstation with mavlink to mini Crossbow tracker?

Thank you