DeuceDriv3r
First Officer
Flight distance : 4698533 ft
United States
Offline
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White Ox Posted at 2018-10-17 18:21
I guess I don't understand why the GPS system goes offline. IF my handheld Garmin did that even a few times a month, I'd be asking them wtf is wrong with it.. GPS systems don't just go offlne with altitude and a perfect view of the sky. Flying in an open field should never yield a GPS signal lost scenario. Imagine firing a cruise missle to a laser marked target - I'm sorry, "GPS signal lost, going into ATTI mode"....
I'm beginning to wonder if the "magnetic interference" situation doesn't yield DJI attempting to reboot those two devices - Compass/IMU and GPS. There's simply no other reason for the GPS to go offline. If there is a discrepancy between GPS north and compass north, for heaven's sake, leave the GPS ON and put it hover while you reboot the Compass/IMU or whatever it is they are doing. So you have a 10 second pause in your flight - that's a hell of a lot better than dropping into atti. If the Compass error continues after the reboot, have the system do a calculated maneuver with the spark (still paying attention to GPS) and determine north via that system - it will NOT be wrong. Once north is determined, then fly home or wait for the user to give stick input after they have acknowledged the error. I simply can't grasp why the GPS system is dropping out.
Real pilots of REAL aircraft are required to read the GPS NOTAMS prior to every flight to check on GPS system health and planned .gov interruptions or system degredation
here is a warning from the website:
Active Notices
Please read the GPS Testing Notices for a list of approved GPS TT&E (testing, training activities, and exercises) that may affect GPS receivers.
Overview of the US Federal Government's Policy on Activities Which May Cause Disruption to GPS:
On occasion, the US Federal Government is required to conduct GPS tests, training activities, and exercises that involve interfering with GPS receivers. These events go through a lengthy coordination process involving the Federal Aviation Administration (FAA), the US Coast Guard (USCG), the Department of Defense (DoD) and other government agencies.
Due to the fact that these training and testing activities can involve a number of aircraft, ships and/or other military equipment and up to hundreds of personnel, cancellation or postponement of a coordinated test should only occur under compelling circumstances. In general, only safety-of-life/safety-of-flight issues will warrant cancellation or postponement of an approved, coordinated GPS test.
In the event that a GPS activity compromises a safety-of-life mission, procedures exist to protect those involved. If a Lifeguard (medical evacuation flight), fire-fighting mission, or other aviation-related activity where GPS navigation is essential is impacted the conflict should be reported to the nearest FAA Air Traffic Control (ATC) facility. FAA will issue ”cease buzzer” (stop exercise) notification to the tester. All testers are required to set up a point of contact immediately reachable via telephone throughout the testing period.
Non-aviation related safety-of-life activities that require immediate cessation of GPS testing should be reported to the USCG Navigation Center (NAVCEN). The NAVCEN will either issue the “cease buzzer” or relay it to the FAA for issuance.
In the event that a safety-of-life conflict is anticipated, but not immediate, the affected GPS user should notify the USCG NAVCEN. An example of this is firefighting activities that may spread to testing areas. In some instances, the USCG may choose to put the tester directly in contact with the affected GPS user. In other cases, the USCG may choose to notify the appropriate government official to resolve the conflict.
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