Hi @jobotics -
Are you using a RC transmitter plugged into the Navigator? If not, you could control the output with a cockpit button as described here. There is also some useful information here.
Good catch on powering the servo rail - that isn’t done in the BlueBoat by default, but is on the BlueROV2! This is because no servos are used by the BlueBoat by default, and so sizing your own power supply for the number and type of outputs you need to power is left to the user!