A collection of calculation and conversion tools

Compass Error from Amplitudes Observed on the Celestial Horizon

Correction of Barometer Reading for Gravity

Correction of Barometer Reading for Height Above Sea Level

Correction of Barometer Reading for Temperature

Distance of an Object by Two Bearings

Conversions coordonnées géographiques

Compass Error from Amplitudes Observed on the Visible Horizon

Length of a Degree of Latitude and Longitude

Dip of the Sea Short of the Horizon

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

Great Circle Sailing

Distance of the Horizon

Relative Humidity and Dew Point

Latitude and Longitude Factors

Barometer Measurement Conversions

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

Conversion for Meters, Feet and Fathoms

Mercator Sailing

Table of Offsets

Meridional Parts

Altitude Correction for Atmospheric Pressure

Geographic Range

Natural and Numerical Chart Scales

Speed for Measured Mile

Calculation of the data in the Sight Reduction Tables for Marine Navigation

Temperature Conversions

Traverse

Logarithmic and Trigonometric Functions Calculator

Distance by Vertical Angle Measured Between Sea Horizon and Top of Object Beyond Sea Horizon

Distance by Vertical Angle Measured Between Waterline at Object and Top of Object

Distance by Vertical Angle Measured Between Waterline at Object and Sea Horizon Beyond Object

Direction and Speed of True Wind

Time Zones, Zone Descriptions, and Suffixes