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Online Calculators
Dip of Sea Short of the Horizon
Local Apparent Sideral Time
UTC Time Tick
Mercator Sailing
Great Circle Sailing
Conversion for Meters, Feet and Fathoms
Speed for Measured Mile and Speed, Time, and Distance
Length of a Degree of Latitude and Longitude
Geographic Range
Distance of the Horizon
Magnetic Delcination
True Wind Calculator
Distance Between Ports
World Port Database
Phenomenon Calculators
Twilight Calculator
Rise, Set and Twilight of Sun and Moon
Time Zone Map
Night and Day View of the Earth
Electronic Bowditch Tables (Resources)
Pub 229
Altitude Correction for Atmospheric Pressure
Altitude Factors & Change of Altitude
Compass Error from Amplitudes Observed on the Celestial Horizon
Latitude and Longitude Factors
Meridian Angle and Altitude of a Body on the Prime Vertical Circle
Compass Error from Amplitudes Observed on the Visible Horizon
Altitude Correction for Air Temperature
Table of Offsets
Meridional Parts
Traverse Table
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Print on demand NOAA charts
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