NMEA Parser - The NMEA 0813 standard for interfacing marine electronics devices specifies the NMEA data sentence structure as well as general definitions of approved sentences. However, the specification does not cover implementation and design. This article will hopefully clarify some of the design tasks needed to parse through NMEA sentences robustly. It will try to show techniques in parsing and data integrity checking. The article does assume that the reader has knowledge in software design and has experience in some sort of programming language. This article will reference the NMEA 0183 specification and it is recommended that the NMEA 0813 specification be available as a reference.