right so I have to have all the electrics on all the time then HFD
? Pitot heat, all radios, nav lights, landing lights, taxi lights, dome lights, instrument lights, strobes, beacons every damm switch on in the plane has to be on all the time so the compass will read correctly?? Sorry but I have to agree with DFC, the point of a compass swing is to make sure that it stays within limits when all the services are turned on on; but that doesn't mean that you have to fly with them on all the time to get max accuracy! If I flew with everything on in the old heaps I instruct on there's no way the battery wouldn't be able to hack it! (and thats if even if all the lights and nav aids work, which is a rareity
)