Onitsha: coordinates, UTM zone and magnetic declination
Survey data sheet for Onitsha (Nigeria) for field work: coordinates, UTM zone, scale factor, grid convergence, today's magnetic declination and geoid undulation, computed for the city center.
Values for the city center (GeoNames coordinate). Declination from the World Magnetic Model 2025 for today's date; geoid from EGM2008. For an exact point, use the tools below.
Nearest GNSS reference stations (IGS)
Tools to use here
FAQ
What UTM zone is Onitsha in?
Onitsha is in UTM zone 32N, with central meridian 9° E. In WGS 84, the city center is at E 254,951 m and N 680,269 m.
What is the magnetic declination in Onitsha?
Today the magnetic declination in Onitsha is 0.51° W, changing by +5.0′ per year (WMM2025 model). To get the true azimuth, add the declination to the magnetic azimuth (East positive, West negative).
What is the geoid undulation in Onitsha?
The geoid undulation (EGM2008) in Onitsha is N = 20.23 m. To convert a GNSS height (ellipsoidal, h) to an approximate orthometric height: H = h − N.
Cities near Onitsha
- Owerri 79 km
- Enugu 85 km
- Umuahia 105 km
- Sapele 126 km
- Benin City 130 km
- Aba 133 km
- Warri 134 km
- Yenagoa 148 km
- All cities in Nigeria
© GeoNames (CC BY 4.0) · Unicode CLDR · WMM2025 (NOAA/BGS) · EGM2008 (NGA) · IGS