DroneFlying
Captain
Flight distance : 10774613 ft
United States
Offline
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First off, kudos to you for asking before attempting this flight: it shows that you're a thoughtful pilot and you obviously have some awareness of and concern for potential problems.
Regarding the loss of GPS, what matters is how much of the sky the Mavic has an unobstructed view of. If you look at Irmanstat's video, the bridge flown under is in the middle of a moderately sizable body of water and part of the sky is visible to the Mavic the entire time.
On the other hand, in the photo you provided the tree line appears to be close by, which means that during your trip under the bridge you may reach a point where little, if any, of the sky is visible from the Mavic's perspective. If that's the case -- and if you linger there long enough -- then there's a good chance that the Mavic will switch into ATTI mode (or OPTI, depending on whether VPS is enabled or disabled) and once it begins to emerge it'll start picking up satellites and eventually revert back to GPS mode.
Personally I avoid flying under things except maybe the canopy of a single tree, and even that I don't do often (though more because I try to avoid trees in general than fear of losing GPS). I suspect that you can probably make the flight you're asking about successfully, but as you obviously guessed it definitely is more risky than just flying in an open area. |
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