"Why does it even need CANbus access - would a simple GPS/accelerometer module not cover 99.9% of all requirements??"
Not when you need logging functionality as well, the GPS/accelerometer won't do that by itself.
"Why does it even need CANbus access - would a simple GPS/accelerometer module not cover 99.9% of all requirements??"
Not when you need logging functionality as well, the GPS/accelerometer won't do that by itself.