class NMEAPlus::Message::NMEA::STR

STR - Tracking Reference

Transmitted prior to a sentence containing velocity-based data to indicate when velocity is measured over-the-ground or relative to the water.

The use of appropriate ground or water-referenced approved sentences such as $–VBW, $–VHW or $–VTG is recommended. @see VBW @see VHW @see VTG