Accept pre-NMEA v2.3 RMC sentences
Allow RMC sentences with 11 parts. RMC sentences before NMEA version 2.3 did not have the mode indicator field, see https://gpsd.gitlab.io/gpsd/NMEA.html#_rmc_recommended_minimum_navigation_information
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Allow RMC sentences with 11 parts. RMC sentences before NMEA version 2.3 did not have the mode indicator field, see https://gpsd.gitlab.io/gpsd/NMEA.html#_rmc_recommended_minimum_navigation_information