I was flying over a riverfilming boats and my PV2+ was having trouble keeping up with the boats. Idecided to switch to ATTI mode and run a speed test. I thought that in ATTImode it would maintain altitude but not position. I started at 40 feet above thewater and at about 40 mph the altitude started to drop rather quickly so l letoff the forward motion to allow the phantom to recover height. That was a faras I got before I started to endeavor on my first under water documentary. A cautionary tale: the phantom can lose altitude and it will not automatically recover it. On the bright side, I now know it will go faster in ATTI mode.
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