For Parrot Bluegrass
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Make sure Parrot Bluegrass has detected the GPS signal in FreeFlight Pro or Pix4Dcapture.
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Check that the propellers of Parrot Bluegrass have been correctly fitted and secured.
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Check that the battery on drone is fully charged.
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Make sure that there is plenty of clearance for take-off and landing.
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Check that the selected geo-fencing distance is sufficient for your flight.
For Parrot Sequoia+
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Make sure Parrot Sequoia+'s lenses are clean. Use the microfiber cloth to clean them.
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Free up enough memory on the SD card or internal memory of the multi-spectral sensor to recover all the pictures taken during the flight.
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Make sure that the two sensors are calibrated. For more information, find out how to calibrate your Parrot Sequoia+ on the Parrot.com support page