Today is my first day with the MP. I decided to take one last flight right after sunset this evening, to test out the long exposure photo mode. When I took off, I had good GPS (16), and zipped around for about 10 min. By the time I was ready to land, it was too dark to take any usable video, and LOS orientation was getting challenging - so I triggered RTH. She came in just as expected until directly above the landing point (I have the RTH altitude set to 50m). As it got to the landing point (but before descending started), I received a "Satellite positioning off. Fly with caution" error That's an understatement. It switched to ATTI mode, as I canceled the RTH, and it continued to move quite rapidly south of my position. By the time I had my bearings, it was at least 500' away from where it should have landed. I reviewed the flight on the DJI app, and it shows zero stick input from the RTH break off point until I started the manual recovery - yet it was moving away from me much faster than wind speed.
On replay, the app continues to show 16 satellites, but the bars drop from full to one little red one. That was the first time (in about 10 flights today) that I saw that happen, and of course, it happened at the worst possible moment.
So my question is, what could cause the GPS signal to go from full to zero when up at 160' on a clear sky evening?
I have several years experience with a number of Phantoms running in ATTI, so I am not unfamiliar with the drift that happens when there is no GPS hold. This was much faster - as though the MP was actually providing directional input.
I calibrated the compass after the second flight (despite receiving no warning that it needed to be performed). I noticed a large circular pattern when hovering, and figured it may have to do with the compass still being set to Shenzhen.
Ideas?
On replay, the app continues to show 16 satellites, but the bars drop from full to one little red one. That was the first time (in about 10 flights today) that I saw that happen, and of course, it happened at the worst possible moment.
So my question is, what could cause the GPS signal to go from full to zero when up at 160' on a clear sky evening?
I have several years experience with a number of Phantoms running in ATTI, so I am not unfamiliar with the drift that happens when there is no GPS hold. This was much faster - as though the MP was actually providing directional input.
I calibrated the compass after the second flight (despite receiving no warning that it needed to be performed). I noticed a large circular pattern when hovering, and figured it may have to do with the compass still being set to Shenzhen.
Ideas?
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