Longitude Minutes to Nautical Miles
Updated recently with improved calculation accuracy and expanded examples.
Nautical miles per minute of longitude at a given latitude (cosine scaling).
Last updated: August 28, 2026
Author: OceanCalc Editorial Team · Publisher: Albor Digital LLC
Longitude Minutes to Nautical Miles
Result
Distance (nm)
7.07
Formula
nm = minutes × cos(lat)What is the Longitude Minutes to Nautical Miles?
Nautical miles per minute of longitude at a given latitude (cosine scaling).
nautical mile
A nautical mile is exactly 1,852 meters. One minute of latitude is approximately one nautical mile, but its exact length varies slightly with latitude on the reference ellipsoid. It is used worldwide in maritime and aviation navigation.
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Overview
A nautical mile is exactly 1,852 meters. A Longitude Minutes to Nautical Miles is used in maritime navigation to perform precise calculations based on established nautical formulas. This tool allows you to apply your inputs to the stated nautical relationships using accurate and standardized methods.
Key takeaways
- Longitude Minutes to Nautical Miles — A nautical mile is exactly 1,852 meters.
- Formula — At the equator, 1' longitude = 1 nm; at latitude φ, east-west distance per minute shrinks by cos(φ).
- How to use — Type your figures into the form; outputs refresh so you can compare cases quickly.
How to use
Type your figures into the form; outputs refresh so you can compare cases quickly.
Formula
Core relationship: nm = minutes × cos(lat)
At the equator, 1' longitude = 1 nm; at latitude φ, east-west distance per minute shrinks by cos(φ).
Practical use cases
Longitude Minutes to Nautical Miles: passage planning, crew briefings, instrument-to-chart unit checks, and verifying mental math when tired or in rough weather.
Tips for accuracy
- Match input units to your chart, GPS, or instrument before trusting the Longitude Minutes to Nautical Miles.
- Cross-check important outputs with a second method or crew when visibility or motion is poor.
- Treat simplified models (waves, radar horizon, etc.) as estimates; real conditions vary.
Practical examples
- 10' lon at 45° ≈ 7.07 nm
Frequently Asked Questions
How accurate is this calculator?
It uses standard maritime formulas and noted approximations. Use it for planning and checks; confirm safety-critical decisions with official sources.
Can I use this on mobile?
Yes. Layouts are responsive for phones and tablets on deck or in the cockpit.
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These calculations are based on standard maritime navigation formulas used in seamanship, chart navigation, and marine route planning.
Results are estimates for educational purposes only and should not be used for real navigation decisions.