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.
43° 51′ 29.73″ N 70° 42′ 40.78″ W
NAD27, converted from NAD83(1986) with NADCON 5.0.
| NAD83(1986) (entered) | 43° 51′ 30.00″ N 70° 42′ 39.00″ W43.858333, -70.710833 |
|---|---|
| NAD27 | 43° 51′ 29.73″ N 70° 42′ 40.78″ W43.858259, -70.711328 |
| Rounded to the second | 43° 51′ 30″ N 70° 42′ 41″ W |
| Shift | 8.3 m south, 39.8 m west40.7 m (133 ft) in all |
| NOAA's stated uncertainty | ±0.11 m latitude, ±0.06 m longitudeOne standard deviation of the NADCON 5 transformation here |
| UTM (NAD27) | UTM Zone 19: 4,857,337.470 m N, 362,464.767 m EUSNG 19TCJ6246557337 |
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.