Marine & Navigation

ETA Current/Wind Compensation Calculator

Estimate ETA delay from current and wind speed penalties.

Last validated: 2026-02-14

ETA Current/Wind Compensation Calculator adjusts calm-water ETA by accounting for current component and a wind-related speed penalty. It is useful for updating arrival forecasts and operational timing when conditions degrade effective speed. The tool outputs compensated ETA and delay relative to calm-water baseline, helping crews communicate schedule impact quickly. Use it as an operations estimate and refine with observed speed-through-water and updated forecasts.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

ETA Inputs

Result

Effective speed: 11.700 kn

ETA with current/wind: 10.26 h

ETA calm-water baseline: 8.00 h

Delay vs calm: 2.26 h

How to use this tool

Enter route distance and calm-water speed.
Input current component (head current positive) and wind speed penalty percentage.
Run the calculator and compare compensated ETA against calm-water ETA.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Distance nm: 120.0
Calm speed kn: 15.0
Current component kn: 1.8
Wind penalty percent: 10.0
Effective speed kn: 11.7
Eta hours: 10.256410256410257
Eta calm hours: 8.0
Delay hours vs calm: 2.2564102564102573

Expected Outputs

Distance nm: 120
Calm speed kn: 15
Current component kn: 1.8
Wind penalty percent: 10

Interpretation

Distance nm is 120.0. Use this as a decision input, not as a standalone conclusion.
Calm speed kn is 15.0. Use this as a decision input, not as a standalone conclusion.
Current component kn is 1.8. Use this as a decision input, not as a standalone conclusion.
Cross-check the result against one alternate input set to validate sensitivity.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

Scenario A

Distance nm

Calm speed kn

Current component kn

Wind penalty percent

Effective speed kn

Eta hours

Eta calm hours

Delay hours vs calm

Scenario B

Distance nm

Calm speed kn

Current component kn

Wind penalty percent

Effective speed kn

Eta hours

Eta calm hours

Delay hours vs calm

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ETA Current/Wind Compensation Calculator

Input Pattern

ETA Inputs

Result

How to use this tool

Worked Example

Example Inputs

Expected Outputs

Interpretation

Scenario Compare (A vs B)

Scenario A

Scenario B

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