Free from Nexus Broadcast
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.
33° 39′ 25.59″ N 90° 42′ 17.66″ W
NAD27, converted from NAD83(1986) with NADCON 5.0.
| NAD83(1986) (entered) | 33° 39′ 26.00″ N 90° 42′ 18.00″ W33.657222, -90.705000 |
|---|---|
| NAD27 | 33° 39′ 25.59″ N 90° 42′ 17.66″ W33.657107, -90.704905 |
| Rounded to the second | 33° 39′ 26″ N 90° 42′ 18″ W |
| Shift | 12.7 m south, 8.9 m east15.5 m (51 ft) in all |
| NOAA's stated uncertainty | ±0.05 m latitude, ±0.19 m longitudeOne standard deviation of the NADCON 5 transformation here |
| UTM (NAD27) | UTM Zone 15: 3,726,307.585 m N, 712,821.777 m EUSNG 15SYT1282226308 |
Studying a site?
RF Navigator takes NAD83 coordinates straight into FM, LPFM, translator, AM and TV studies, and Nexus Broadcast can handle the engineering and the FCC filing for you.
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.