Nautical Calculators of use in Lighthouse Research

Geographic Range Input the height of a light above water level and the height of the eye of the observer above water level, and this calculator will compute its geographic range of visibility.

Distance to the Horizon Input the height of eye of the observer above water level, and this calculator computes the distance to the horizon.

Fathom Conversion Input distance in feet or meters and calculate fathoms, or input fathoms to convert to feet and meters.

Nautical to Statute Miles Input distance in statute miles and convert to nautical miles, or input distance in nautical miles and convert to statute miles.