Which of the following is NOT a NEMA string used for buoy positioning?

In the context of NMEA (National Marine Electronics Association) strings, each string corresponds to specific types of data transmitted by marine electronics, particularly in GPS devices. The strings mentioned are used for various positioning and navigational purposes.

The NMEA strings GRS, GGA, and GSA are widely recognized and utilized in marine navigation.

• GRS (Recommended Minimum Specific GPS/Transit Data) string provides information on the status of the GPS fix and the number of satellites being used for the fix, along with the Horizontal Dilution of Precision (HDOP).
• GGA (Global Positioning System Fix Data) string transmits essential fix data, including the time of the fix, latitude, longitude, and altitude, providing critical positioning information.
• GSA (Satellite Status) string gives details on the satellites currently being tracked and the quality of the navigation solution, indicating which satellites are providing the best data for accurate positioning.

In contrast, TPA (Track Production Algorithm) is not recognized as a standard NMEA string that is used for buoy positioning or navigation data. Hence, it does not pertain to the established categories of data typically related to marine positioning, affirming that it is the correct answer as it represents a non-standard NMEA