The NORSUB internal protocols are a suite of proprietary, in-house communication standards developed for various marine and subsea applications. These protocols, including NORSUB , NORSUB2 , NORSUB6 , NORSUB7 , NORSUB6g , NORSUB7b , NORSUB8 , and NORSUB PRDID , follow the general structure of the NMEA-0183 standard.