Umuahia: coordinates, UTM zone and magnetic declination
Survey data sheet for Umuahia (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 Umuahia in?
Umuahia is in UTM zone 32N, with central meridian 9° E. In WGS 84, the city center is at E 333,242 m and N 610,898 m.
What is the magnetic declination in Umuahia?
Today the magnetic declination in Umuahia is 0.46° W, changing by +4.9′ 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 Umuahia?
The geoid undulation (EGM2008) in Umuahia is N = 19.96 m. To convert a GNSS height (ellipsoidal, h) to an approximate orthometric height: H = h − N.
Cities near Umuahia
- Aba 49 km
- Owerri 51 km
- Uyo 72 km
- Port Harcourt 99 km
- Enugu 102 km
- Onitsha 105 km
- Calabar 112 km
- Yenagoa 151 km
- All cities in Nigeria
© GeoNames (CC BY 4.0) · Unicode CLDR · WMM2025 (NOAA/BGS) · EGM2008 (NGA) · IGS