Somethign is probably off.
Navigator is detect upon detecting these:
ADS1115_address = 0x48 on i2c-1
AK09915_address = 0x0C on i2c-1
BME280_address = 0x76 on i2c-1 (this one is the on-board baro)
PCA9685_address = 0x40 on i2c-4
Argonot is detected upon detecting:
swap_multiplexer_address = 0x77 on i2c-1
If detection (and ardupilot itself) is failing, something is probably off with your board. Try reducing the i2c baud in /boot/config.txt
you may need to add # CUSTOM after the changed lines so blueos doesnt change them back.