Free Online Geography & Mapping Tools
Calculate bearings, map scales, spherical coordinates, terrain relationships and web tiles with online mapping tools.
Choose the right tool
Choose great-circle tools for shortest spherical paths and rhumb tools for constant bearings. Spherical models differ from ellipsoidal survey calculations. Web-map tiles have latitude limits and grid bearings require a stated convergence convention.
Available tools
- Great Circle Initial Bearing Calculator
Online great circle initial bearing calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Great Circle Arrival Bearing Calculator
Online great circle arrival bearing calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Destination Coordinates from Bearing and Range
Online destination coordinates from bearing and range. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Great Circle Midpoint Calculator
Online great circle midpoint calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Rhumb Line Distance and Bearing Calculator
Online rhumb line distance and bearing calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Back Azimuth Calculator
Online back azimuth calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Shortest Bearing Turn Calculator
Online shortest bearing turn calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- True Bearing from Magnetic Declination
Online true bearing from magnetic declination. User-supplied dated local declination; east positive, west negative.
- Grid to True Bearing Calculator
Online grid to true bearing calculator. Convention is true bearing equals grid bearing plus supplied convergence.
- Map Distance to Ground Distance
Online map distance to ground distance. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Ground Distance to Map Length
Online ground distance to map length. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Map Scale from Paired Distances
Online map scale from paired distances. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Map Area to Ground Area Calculator
Online map area to ground area calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Contour Gradient Estimate
Online contour gradient estimate. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Terrain Slope Angle from Elevation Change
Online terrain slope angle from elevation change. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Slope Distance to Horizontal Distance
Online slope distance to horizontal distance. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Geometric Horizon Distance Calculator
Online geometric horizon distance calculator. Spherical Earth, no refraction or terrain obstruction.
- Two Observer Geometric Visibility Range
Online two observer geometric visibility range. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Earth Curvature Drop from Tangent
Online earth curvature drop from tangent. Geometric drop below local tangent, not obstruction height from an eye-level sightline.
- Spherical Latitude Degree Length
Online spherical latitude degree length. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Spherical Longitude Degree Length
Online spherical longitude degree length. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Latitude Parallel Circumference
Online latitude parallel circumference. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Spherical Latitude Band Surface Area
Online spherical latitude band surface area. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Spherical Latitude Longitude Rectangle Area
Online spherical latitude longitude rectangle area. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Spherical Earth Cartesian Coordinates
Online spherical earth cartesian coordinates. Spherical coordinates, not WGS84 ellipsoidal ECEF.
- Cartesian to Spherical Latitude Longitude
Online cartesian to spherical latitude longitude. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Web Map Tile from Coordinates
Online web map tile from coordinates. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Web Map Tile Center Coordinates
Online web map tile center coordinates. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Web Map Zoom Tile Count
Online web map zoom tile count. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Map Tile Quadkey Encoder
Online map tile quadkey encoder. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Web Map Ground Resolution Calculator
Online web map ground resolution calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- XYZ to TMS Tile Y Calculator
Online xyz to tms tile y calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Longitude to Standard UTM Zone
Online longitude to standard utm zone. Standard six-degree zones; Norway and Svalbard exceptions not applied.
- Longitude Wrap Normalizer
Online longitude wrap normalizer. Input may span multiple rotations.
- Longitude Solar Time Offset Calculator
Online longitude solar time offset calculator. Geometric mean solar-time offset; not a civil timezone or daylight-saving conversion.
- Spherical Cross Track Distance
Online spherical cross track distance. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Spherical Along Track Distance
Online spherical along track distance. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Earth Chord from Surface Arc Length
Online earth chord from surface arc length. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Spherical Triangle Area from Angles
Online spherical triangle area from angles. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Naismith Walking Duration Scenario
Online naismith walking duration scenario. Simple hiking planning heuristic; excludes descent, terrain, weather and individual capability.