Latitude and longitude
The geographic system based on latitude and longitude is the most widely used method for identifying positions on Earth.
Latitude measures the distance from the equator, while longitude measures the distance from the Greenwich meridian. Coordinates are generally expressed in decimal degrees or in degrees, minutes and seconds.
UTM system
The UTM (Universal Transverse Mercator) system divides the Earth into vertical mapping zones and uses metric coordinates expressed in meters.
This system is widely used in technical cartography, outdoor GPS devices and hiking activities, because it makes distance measurements on the ground easier.
Geodetic datums
A datum defines the mathematical model of the Earth used to represent geographic coordinates.
Different datums can produce shifts of even hundreds of meters between apparently identical coordinates. The most widely used datum in modern GPS systems is WGS84.
Map projections
Map projections make it possible to represent the curved surface of the Earth on a flat map.
Every projection inevitably introduces distortions of distances, areas or angles, therefore choosing the correct projection depends on the intended cartographic use.
Compatibility between GPS and maps
When using raster maps, GPX tracks or GIS software, it is important to verify that the coordinate system, projection and datum are compatible with each other.
Configuration errors can cause GPS position shifts or map alignment problems.
Coordinate management with OkMap
OkMap supports numerous coordinate systems, geodetic datums and map projections.
The software allows you to convert coordinates, calibrate maps and work with GPS data coming from different devices and cartographic sources.