National Marine Electronics Association (NMEA)

A electronic and data specification ofr communication between marine electronic devices.  There are two standards I could find NMEA 0183 and NMEA 2001.

The Wiki pages lack history:

http://en.wikipedia.org/wiki/NMEA_0183

http://en.wikipedia.org/wiki/NMEA_2000

This is the official site:

http://www.nmea.org/

It cost over $300.00 to buy a copy of the standard.

Compressed ARC Digitized Raster Graphics (CADRG)

A site talking about maps:  http://www.aeroplanner.com/cadrg/what.cfm

Some info for Wikipedia:  http://en.wikipedia.org/wiki/GIS_file_formats

Open Geospatial Consortium, Inc.(R) (OGC)

http://www.opengeospatial.org/

A non-profit, international, voluntary consensus standards organization for geospatial and location based services.