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Name Template: PUB/MISSION/level1b/gpsBit/YYYY.DDD/gpsBit_IIII.YYYY.DDD.HH.MM.GGG_SSSS.VVVV_txt

DDDDay of year
GGGGNSS id (G28 = GPS satellite 28)
IIIIMission ID (CHAM, SACC, CO01-06, GPSM, etc)
LLLLEO number (1-6 for COSMIC)
MISSIONMission ID (eight characters or less--champ, champrt, sacc, sacctst, etc)
PUBBase directory for the pub hierarchy
SSSSSubtype (an ID which tells the command options used in generating this file)
VVVVVersion (an ID which tells the version of all codes using in generating thie file)

File containing Navigation bits used for processing open loop data in the lower troposphere.