Underwater GPS recv data

Right now we just stop mavproxy at the start and do not turn it back on again, but as i understand we could turn it back on again later in the code, without getting an error message?

What sould you write to turn it back on?

The error message is as post 5 in this thread:
https://discuss.bluerobotics.com/t/mavgen-py-to-translate-but-how/2126/4