Hello all,
I have finally set out to do my first test but have failed to pass the motor test as instructed in the BlueBoat Software Setup.
Have you tried testing the motor separately with a servo tester to see if it function normally? This will help you isolate the problem to either a defective motor or software configuration issue.
@rovtour thank you for your advice. Now that I learned about it, a servo tester should definitely be a part of my toolkit. Although I doubt two brand new motors/ESC’s have failed. I will be on a field trip for another day so I can’t test that. I am hoping it is a solvable software issue that I can sort out and possibly put the BB where it belongs (not on the bench)!
Problem solved. Did a clean install of BlueOS and did the motor test b4 I touch anything else and motors started to respond as expected! It looks like the BB is going to get wet! 
I have located the source of the problem. I have connected a 4G modem (SIM7600G-H_4G_HAT). It is supposed to be a HAT but should be able to work independently via the USB port.
The moment I install the drivers, I lose control of the motors.
When connected to the PI’s USB port, it occupies the “/dev/ttyS0” serial port as opposed to “true USB” devices that occupy PI’s “/dev/ttyUSBX” ports.
I assume the the 4G modem is “clashing” with the Navigator since both are HATs and communicate through the serial port. Is there a solution to operate both at the same time, or I should replace it with a USB modem?
