After completion, click on the CONNECT on top right corner of the window to connect the APM board to PC. Now it will show the Device as "Quadrotor". Step 2 - Calibrating Compass and Accelerometer. Now again go to the Initial Setup tab and click on Mandatory Hardware.
So here's the issue: My APM2.0 always has the 3DFix light go solid within a couple minutes, but quite frequently Mission Planner will display "No GPS" (and of course hdop:0 and sats:0) when connected via 3DR radios. I can get the GPS to register by disconnecting Mission Planner, pressing the reset button on the APM2, and then reconnecting Mission Planner. The GPS will keep its 3D Fix during Logical Serial Port to Physical UART Assignment. ArduPilot Serialx Port numbering is logical, rather than physical. Which UART or USART port is assigned to a Serial Port is determined by the autopilot’s hardware definition file. Serial Port 0 is always assigned to the USB port, but others can vary. Check its description page.The bad thing is, that it also loses the GPS signal in Mission Planner. I took a look at the "Full Parameter List" in Mission Planner and saw, that I can change the GPS protocol to NMEA. As this gave me stable and good signals in u-center, I configured the M8N again in u-center to the out protocol NMEA with a baudrate of 38400 at 5Hz
YFBp.