If for instance you watch the massive ships series on Quest - they covered a FSPO, though that one wasn't powered, once in position it floated around the fixed bouy it was connected to, no engine as it wasn't required, this one on the other hand is powered, I suspect though the bridge is still used in the conventional way and they probably use radar primarily, when they get to any shipping lanes they probably deploy staff to keep watch up forward with radios other wise when in normal operation it probably has to move around the Ghanan oil field every couple of years, and as the suez takes most traffic they probably won't be that close to the west African shipping lanes and therefore not in the way. just a thought