Navigation Calculators

Originally programmed by NGA; reformatted, annotated, and expanded by
Starpath School of Navigation

For iOS apps, view in Safari / Share / Add to Home Screen

Celestial Navigation

Altitude Correction for Air Temperature

Compass Error from Amplitudes Observed on the Celestial Horizon

Compass Error from Amplitudes Observed on the Visible Horizon

Altitude Factors and Change of Altitude in a Given Time from Meridian Transit

Latitude and Longitude Factors

Meridian Angle and Altitude of a Body on the Prime Vertical Circle

Table of Offsets

Altitude Correction for Atmospheric Pressure

Sight Reduction and Pre-computation

Dip of the Sea Short of the Horizon

Nautical Almanac data (www.starpath.com/usno)

 

Conversions

Conversion for Meters, Feet and Fathoms

Chart Scales and Conversion for Nautical Miles, Statue Miles and Feet

Barometer Units Conversions

Temperature Units Conversions

 

Distance Calculators

Distance of an Object by Two Bearings

Length of a Degree of Latitude and Longitude

Distance of the Horizon - Given the Height of Eye

Meridional Parts

Geographic Range

Speed for Measured Mile and Speed, Time and Distance

Traverse Table


Distance by Vertical Angle (1) Between Sea Horizon and Top of Object Beyond Sea Horizon

Distance by Vertical Angle (2) Between Waterline at Object and Top of Object


Distance by Vertical Angle (3) Between Waterline at Object and Sea Horizon Beyond Object


Log and Trig Calculators

Logarithmic and Trigonometric Functions Calculator


Sailings

Great Circle Sailing

Mercator Sailing


Time Zones Calculators

Time Zones, Zone Descriptions, and Suffixes


Weather Related Calculators

Correction of Mercury Barometer Reading for Gravity


Correction of Barometer for Height Above Sea Level


Correction of Mercury Barometer Reading for Temperature

Relative Humidity and Dew Point


Barometer Units Conversions

Temperature Units Conversions


Direction and Speed of True Wind