Two balls in a vertical line mean different things when used as a buoy topmark or on board a ship Which two meanings are correct A Preferred Channel B Fairway C Isolated danger D Pilot Vessel E Not...
You are approaching a harbour which has a bar with a charted height 0.6 metres below chart datum. Your Boat draws 1.4 metres and owing to the fairly calm conditions, you judge that a clearance of 0.5...