mapbench

MapBench tool category

Distance & Bearing Map Tools

Distances, bearings and midpoints. This hub groups 37 tools that answer related geographic questions while keeping the underlying method, data source and limitations visible.

Choose the tool that matches the question rather than the one with the most familiar name. Related tools can use different geographic models and legitimately return different answers.

View all 37 →

How to use this category well

Distances and bearings use haversine great-circle math on the WGS84 mean sphere (R = 6371.0088 km), accurate to ~0.3% of ellipsoidal geodesics; the methodology page documents the full recipe.

  • Always confirm which distance you need before quoting one: straight-line for physical questions, road distance for driving, and network time for schedules. The three can differ by half again in mountainous or island geography, and quoting the wrong one is the most common distance mistake in reports.
  • Remember that bearings are true-north by default. If you are transferring a bearing to a magnetic compass, add (or subtract) your local declination — it exceeds 10° in many inhabited regions and flips hemispheres of behaviour.
  • Use the midpoint tool instead of averaging coordinates when splitting journeys: latitude/longitude averages distort over long legs and fail across the date line, while the spherical midpoint follows the actual path the distance was measured along.

Key terms

Great circle

A circle centred on Earth's centre; its arcs are the shortest surface paths.

Haversine

The standard stable formula for great-circle distance on a sphere.

Initial bearing

Compass angle from true north at departure along a great circle.

Geodesic

The ellipsoid-true shortest path; haversine approximates it within ~0.3%.

Related guides & original research

When to verify with an official source

MapBench is designed for analysis, learning and planning. If the result affects a legal boundary, surveying, emergency response, engineering, regulated eligibility, official statistics or a financial commitment, verify the underlying information with the responsible authority or qualified professional.