Office of Coast Survey
National Oceanic and Atmospheric Administration
U.S. Department of Commerce

NOAA RNC® – Raster Navigational Charts

What are RNCs?

NOAA Raster Navigational Charts (NOAA RNC®) are geo-referenced digital images of NOAA nautical charts. RNCs are used by recreational boaters in many types of electronic chart systems and “chart plotters,” which can provide real-time ship positioning when connected to a GPS enabled device.

NOAA RNCs comply with the International Hydrographic Organization RNC Product Specification.

Updates for RNCs

Updated full RNC files are available as often as weekly. These provide critical changes as well as the routine addition of newly compiled data, such as hydrographic or shoreline surveys. The NOAA Weekly Chart Updates page shows the areas that have changed on each RNC since its last new edition was published.

RNC Tile Service

The RNC Tile Service provides the same chart images broken into thousands of tiles, which computers can display faster and using less memory. Several third-party data providers make RNC tiled data available in their chart display devices.


NOAA raster navigational charts (NOAA RNC®) are full-color digital images of NOAA paper charts. RNCs are compatible with most marine navigation software, and are available for free.

Revised: 10/2/2017