Online coordinate converter from Sister Islands National Grid 1961 (EPSG:6129) to WGS 84 / Pseudo-Mercator (EPSG:3857). Enter your source coordinates and get the result instantly. All transformations happen in your browser — no data is sent to any server.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:6129", "EPSG:3857", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)projected system measured in linear units (typically metres) · Area of use: Cayman Islands - Little Cayman and Cayman Brac
+proj=tmerc +lat_0=0 +lon_0=-81 +k=0.9996 +x_0=499999.999998 +y_0=0 +ellps=clrk66 +units=ft +no_defs +type=crsMore about EPSG:6129 →
projected system measured in linear units (typically metres) · Area of use: World - 85°S to 85°N
+proj=merc +a=6378137 +b=6378137 +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +k=1 +units=m +nadgrids=@null +wktext +no_defs +type=crsMore about EPSG:3857 →