Treat air draft as a route constraint and verify it with current official information and the marina operator.
Measuring air draft above the waterline
Record height above the relevant waterline, including antennas, wind instruments, aerials and equipment that cannot be lowered. State whether your figure changes with loading or a removable fitting.
Do not substitute mast length for air draft. Ask the operator what reference and clearance margin it uses when discussing the approach.
- Which equipment is included in my air-draft figure?
- What clearance margin should I allow?
- Does tide or water level affect the route?
Bridges, overhead cables and the marina approach
Ask about fixed and opening bridges, cables, locks and local procedures between open water and the proposed berth. Then consult current official charts, notices and authority information.
Opening times and clearances can change. Build a passage plan from current sources rather than treating a marina profile or older cruising note as navigation advice.
- Which restriction is lowest on the route?
- Who controls any bridge or lock opening?
- Where is the current official information published?
QUESTIONS ANSWERED
Frequently asked questions about marina berth planning
Is mast length the same as air draft?
No. Air draft is the boat’s vertical clearance requirement above the relevant waterline, including fixed equipment.
Can a marina confirm bridge clearance?
The operator can explain its usual approach, but use current official navigation information for passage decisions.
Does tide change air-draft clearance?
It can. Local water levels and the stated clearance reference matter, so verify current conditions and official guidance.
For more common questions, visit the marina berth FAQ.