Marine Leeway Estimate Calculator
Apply a user-supplied leeway angle to heading to calculate a water-track bearing.
A QUICK WALKTHROUGH
How to use this tool
- Enter heading, your leeway angle and its side.
- Calculate the result.
- Copy the report or download it as TXT.
Formula and units
Water track = normalize(heading ± leeway). Add for starboard, subtract for port. Heading is 0–360°, leeway is 0–180°, and output is normalized to 0–360° excluding 360°.
Scope
This uses your stated leeway; it does not estimate wind effects. The result is a track through water, not course over ground. Currents and other effects are excluded. This is an arithmetic demonstration, not safe-navigation advice.
Local processing
Your entries stay in your browser. Copy and TXT export include the inputs, formula and scope.
GOOD TO KNOW
Common questions
How should I use the result?
Use it as an arithmetic estimate based on your supplied inputs.