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NAD27 to NAD83 coordinate converter
Old tower records, deeds and FAA studies often give coordinates in NAD27; today's FCC filings use NAD83. Convert either way with NOAA's official NADCON 5 grids, in decimal degrees or degrees, minutes and seconds.
27° 50′ 51.81″ N 82° 45′ 48.94″ W
NAD27, converted from NAD83(1986) with NADCON 5.0.
| NAD83(1986) (entered) | 27° 50′ 52.90″ N 82° 45′ 48.30″ W27.848028, -82.763417 |
|---|---|
| NAD27 | 27° 50′ 51.81″ N 82° 45′ 48.94″ W27.847726, -82.763594 |
| Rounded to the second | 27° 50′ 52″ N 82° 45′ 49″ W |
| Shift | 33.5 m south, 17.4 m west37.7 m (124 ft) in all |
| NOAA's stated uncertainty | ±0.14 m latitude, ±0.12 m longitudeOne standard deviation of the NADCON 5 transformation here |
| UTM (NAD27) | UTM Zone 17: 3,081,412.127 m N, 326,337.020 m EUSNG 17RLL2633781412 |
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About the conversion
- Every conversion is NOAA's: the National Geodetic Survey's NCAT service with the NADCON 5.0 transformation grids, the official way to move coordinates between NAD27 and NAD83.
- NAD83 here is NOAA's NAD83 (1986), the original NAD83; FCC applications give coordinates in NAD83. The shift from NAD27 is typically tens of meters in the lower 48 and more in Alaska.
- NAD27 was used in the contiguous U.S. and Alaska only, so points in Hawaii, Puerto Rico and the territories can't be converted from it.
- The two coordinates entered are taken as being in the datum you convert from. A bare positive longitude is read as west.
NOAA's own tool: NCAT (and about NADCON 5).
For planning. Not a product of NOAA or the FCC.