Vertical Clearance Calculator
Highest Astronomical Tide for this location
Predicted tide height when you arrive
Highest point above waterline
Additional clearance buffer
How to Use
- • Enter bridge clearance height at HAT (from charts)
- • Input the HAT value for your location
- • Enter predicted tide height at your arrival time
- • Input vessel air draft and desired safety margin
- • Calculator determines if passage is safe using HAT methodology
⚠ Safety Notice
This calculator uses HAT-based methodology for planning purposes only. Always verify with current charts, tide tables, and local authorities. Consider wave action, vessel squat, and other factors.