"Yep, send an email.. I needed fast shipping, and he got back to me very quickly and took care of it.
As of a few days ago he was out of power modules in the US, and out of the GPS cables for 3dr GPS's. Everything else was able to…"
it depends on your setup.
With -B you can announce ardupilot where the GPS is connected to
-C MAVLink connection: If there is no telemetry radio and the BBBmini is connected via USB Network to your host computer with GCS than you have to…"
"Thank you Mirko, so if APM is started and I connect the BBBmini to my USB and ran ground station, is mavlink connection going to work by USB? Or do I need to add parameters such as "-B /dev/something""
you may could use the GPS but I recommend to use a UBLOX M8N. The Grove IMU is connected via I2C and the BBBmini use SPI. As result you can not use the Grove IMU without changing the ArduPilot source code.