Ignoring this field in 4.11 means your device ignores centimeter-level accuracy data.
Some of the key features of NMEA 0183 Version 4.11 include: Nmea 0183 Version 4.11 Pdf
The NMEA has released numerous versions since the original 1.5 standard. Version 2.0 introduced the GGA , RMC , and GSA sentences we know today. Version 3.0 added support for faster baud rates. Ignoring this field in 4