GPS and GNSS Navigation
Explore satellite positioning, GNSS measurements, navigation geometry, positioning accuracy and satellite-based navigation concepts.
GPS & GNSS Tools, Satellite Calculators and Geospatial Utilities
Welcome to OG2.org, an online collection of tools for GPS and GNSS navigation, coordinate transformations, satellite positioning, geodesy, orbital mechanics and geospatial analysis. Explore practical calculators and engineering utilities for working with geographic coordinates, navigation measurements, satellite signals and positioning systems.
GPS, GNSS and Satellite Calculators
Use these online calculators to explore navigation measurements, coordinate systems, satellite geometry, positioning accuracy, orbital parameters and signal propagation. Select a tool to open its calculator.
GPS Distance Calculator
Calculate the geographic distance between two GPS coordinates.
GPS NavigationCoordinate Converter
Convert geographic coordinates between supported coordinate formats.
Coordinate SystemsSatellite Position Calculator
Calculate satellite position using orbital and navigation parameters.
Satellite NavigationDOP Calculator
Analyze dilution of precision for satellite positioning.
GNSS AnalysisTime Conversion Tool
Convert time values used in GPS and satellite navigation systems.
GPS TimeGeoid Height Calculator
Explore geoid height and vertical reference calculations.
GeodesyGPS Velocity Calculator
Calculate velocity from GPS position and time measurements.
GPS NavigationOrbital Period Calculator
Calculate orbital period using orbital mechanics parameters.
Orbital MechanicsLine of Sight Calculator
Estimate line-of-sight distance and visibility between locations.
Visibility AnalysisSignal Travel Time Calculator
Calculate signal propagation and travel time over a distance.
Signal PropagationSatellite Coverage Area Calculator
Estimate the geographic coverage area of a satellite.
Satellite CoverageGPS Error Estimator
Explore positioning errors and factors affecting GPS accuracy.
GNSS AccuracyElevation Mask Angle Calculator
Calculate satellite elevation mask angles for GNSS observations.
Satellite VisibilityECEF to LLA Converter
Transform Earth-Centered Earth-Fixed coordinates into latitude, longitude and altitude.
Coordinate SystemsGPS Week Number Converter
Convert GPS week numbers and related GPS time values.
GPS TimeExplore Navigation and Geospatial Engineering
OG2 brings together different areas of satellite navigation and geospatial engineering in one place.
Coordinate Systems and Geodesy
Work with geographic coordinates, coordinate transformations, Earth reference systems, geoid measurements and geodetic calculations.
Satellite and Orbital Mechanics
Investigate orbital periods, satellite positions, coverage areas, visibility and other parameters related to satellite motion.
Signals and Propagation
Explore signal travel time, radio propagation, line-of-sight calculations and factors affecting satellite navigation signals.
Positioning and Navigation Analysis
Examine navigation measurements, satellite visibility, elevation angles, velocity and positioning error estimates.
Engineering Calculations
Use practical online utilities to explore mathematical and engineering relationships relevant to positioning and geospatial systems.
About OG2.org
OG2.org provides online tools and technical resources related to GPS, Global Navigation Satellite Systems (GNSS), satellite navigation, geodesy and geospatial engineering.
The calculators are designed to make selected navigation and engineering calculations accessible through a web browser. They can support learning, experimentation, preliminary calculations and exploration of technical concepts.
Results should be interpreted according to the assumptions, input parameters and limitations of each individual calculator. For professional surveying, navigation or safety-critical applications, use validated data and appropriate professional procedures.