Seattle: coordinates, UTM zone and magnetic declination
Survey data sheet for Seattle (United States) 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 Seattle in?
Seattle is in UTM zone 10N, with central meridian 123° W. In WGS 84, the city center is at E 550,202 m and N 5,272,750 m.
What is the magnetic declination in Seattle?
Today the magnetic declination in Seattle is 14.87° E, changing by −7.4′ 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 Seattle?
The geoid undulation (EGM2008) in Seattle is N = −22.76 m. To convert a GNSS height (ellipsoidal, h) to an approximate orthometric height: H = h − N.
Cities near Seattle
- Portland 233 km
- Sacramento 1,006 km
- Stockton 1,076 km
- Oakland 1,090 km
- San Francisco 1,093 km
- San Jose 1,142 km
- Fresno 1,226 km
- Bakersfield 1,388 km
- All cities in United States
© GeoNames (CC BY 4.0) · Unicode CLDR · WMM2025 (NOAA/BGS) · EGM2008 (NGA) · IGS