I put an ext compass to my APM on the tall gps mast under the gps but I can move a little from side to side with my hand; that it can affect compass? where or how is the best place to fix it?, time to time the copter yaw a little I'm not shure if it is that little movement the problem.
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The best is to have a very solid mast that do not allow any side by side movement, Little movements can lead to disorientation with the vibration. Good thing you have it in a mast but it should be sturdy and not so tall, 3 inches or 75mm give you a good clearance of the motor induced magnetic field a better GPS receiving. There are a bunch of good mast in the market and they are not very expensive.
Hope it helps
Juan
Thank's for the answers, That exact what it do Hugues.
Good Tip Forrest I'm going to try; I continue denying with this reformed cuad; at hover little vibs but when I fly vibs become worse, not unflyable but not desirable; I open the APM box and find that APM bolts where loose; when I changed the magnetized bolts for others where the problem (perhaps I belive Hugues theory about Aliens inside it).Ithigten them and remove the rubber washers and test a little but It flies worse; I notice the APM isn't perfect aligned. That can be a problem?
The other cuad flies perfect in two days, this one definitively have Alliens.
I do not think this has a lot of impact. If your compass is not perfectly aligned with your quadcopter's front, it will just move a bit like a crab !
see if you can find a descent hiking compass and move it around the ship looking for a place that has the least needle deviation from magnetic north. taking the props off and having the motors running can be advantageous.