🧭 Navigation & Safety Calculators

Nautical mile converter, speed/distance/time, true wind, anchor rode, current drift, channel depth, wave height, and visibility calculators.

Convert between nautical miles, statute miles, and kilometers. Essential for navigating between chart distances and GPS readings.

Calculate speed, distance, or time for marine navigation. Enter any two values to find the third. Works in knots and nautical miles.

Calculate true wind speed and direction from apparent wind readings and boat speed. Essential for sailors and weather-conscious boaters.

Calculate the proper anchor rode length (scope) based on water depth, tidal range, and conditions. Get the right scope for safe anchoring.

Calculate course correction needed to compensate for current or tide set and drift. Determine your course to make good (CMG).

Determine if your boat can safely transit a channel at a given tide level. Account for draft, squat effect, and safety margin.

Assess wave conditions for your boat size and type. Determine safe operating limits based on wind speed and fetch distance.

Calculate the distance to the visible horizon from your helm height. Determine how far you can see other vessels, lights, and landmarks.