Navigation Calculators
Free navigation calculators.
Great circle distance, bearing, magnetic declination, ETA, and waypoint tools for any journey.
Anchor Scope Calculator
Calculate anchor rode length (chain plus rope) from water depth and sea conditions. Returns 5:1 to 10:1 scope ratios for safe anchoring in any conditions.
Rhumb Line Course and Distance Calculator
Calculate rhumb line bearing and distance between two lat/lon coordinates. Returns true course in degrees, distance in nm and km, and great circle comparison.
Cross-Track Error and Course Correction Calculator
Calculate cross-track error and bearing correction to return to a planned course. Find the intercept angle needed from your current position.
Compass Bearing Calculator
Calculate the true compass bearing from one location to another using latitude and longitude. Get the exact heading for any route.
Compass Deviation and Variation Calculator
Convert between true north, magnetic north, and compass heading. Apply variation and deviation corrections for accurate navigation.
ETA Calculator
Calculate your estimated time of arrival from current position, distance remaining, and speed. Works for driving, sailing, hiking, and flying.
Fuel Per Navigation Leg Calculator
Calculate fuel needed for each leg of a multi-stop journey in nautical miles or km. Plan fuel stops for sailing, boating, or long-distance driving routes.
Great Circle Distance Calculator
Calculate the shortest distance between any two points on Earth using latitude and longitude. Uses the Haversine formula for accurate results.
Magnetic Declination Calculator
Convert between true north and magnetic north. Apply the correct declination to your compass bearing for accurate navigation anywhere in the world.
Speed Distance Time Calculator
Calculate speed, distance, or time from any two known values. Works for any mode of transport — sailing, driving, cycling, running.
Sunrise and Sunset Time Calculator
Calculate sunrise, sunset, golden hour, and civil twilight for any date and coordinates. Returns day length, solar noon, and blue hour start and end times.
Waypoint Dead Reckoning Calculator
Calculate your estimated position from a known starting point using heading, speed, and elapsed time. Works on land, sea, and air.
Wind Correction Angle Calculator
Calculate wind correction (crab) angle from airspeed, wind speed, and direction. Returns heading correction and ground speed for aviation and sailing.