Ive already posted a thread about a problem with the firmware. After i upgraded it, it showed me this problem, wich also occures when downgrading and upgrading again, in lower versions too. Today i found something interesting wich *may* be the problem I have these errors: Compass is telling me it needs to be calibrated, But it everytime gives me the strong interferance error, even in the middle of a field. Well, looking under the sensors tab, the phantom is not showing me any compass data, also when moving it around Is something wrong with the GPS? It worked before i upgraded the firmware, but the problem now occures too in lower versions.