APM 2.8 MP 1.3.37 firmware version 3.2.1 .. problem is yellow LED blinking and red LED double blingking.. need 3D fix and no gps ? now how i solve this? - Help - DroneTrest
![GPS fix status (3-[3D], 2-dimensional [2D], and no fix) for each black... | Download Scientific Diagram GPS fix status (3-[3D], 2-dimensional [2D], and no fix) for each black... | Download Scientific Diagram](https://www.researchgate.net/publication/242200058/figure/fig1/AS:341311401021467@1458386388526/GPS-fix-status-3-3D-2-dimensional-2D-and-no-fix-for-each-black-bear-and-the.png)
GPS fix status (3-[3D], 2-dimensional [2D], and no fix) for each black... | Download Scientific Diagram
![Cannot Arm in any GPS mode: 16 sats, .7 HDOP 3D Fix = Error: No 3D Fix - Copter 4.0 - ArduPilot Discourse Cannot Arm in any GPS mode: 16 sats, .7 HDOP 3D Fix = Error: No 3D Fix - Copter 4.0 - ArduPilot Discourse](https://discuss.ardupilot.org/uploads/default/original/3X/b/4/b42850d0d3144d67af91ad82c1f455cda9b1f6e4.jpeg)