Take Off from a boat: calibration problems?

Hi everyone,
I need to take videos of whales in the Indian Ocean
The takeoff will be from a boat
So the copter will be in motion battery is plugged (wave woobles)
I know that I must not move the copter at that time
So my question is simple: Will I be able to properly arm my copter if it moves when the battery is plugged ?
Is the gyro and accelerometer will be properly calibrated?

My config:
Quad Octa with pixhawk and arducopter 3.1.3

so what was your experience ? :slight_smile: - easier than expected ?