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Release March 2003 ZDA – Time and Date The ZDA message contains UTC, the day, the month and the year of the local time zone. $GPZDA,hhmmss.s,xx,xx,xxxx,xx,xx Field Number 1 2 3 4 5 6 Description UTC. Day (0 – 31). Month (0 – 12). Year. Local Zone Description Hours (± 13 Hours). * Local Zone Description Minutes. Table 19: Description of the ZDA message. NOTES: * Local zone description is the number of whole hours added to local time to obtain UTC. The zone description is always negative for eastern longitudes. Fields 5 and 6 are Null fields in the “Trimble BD132”. A GPS receiver cannot independently identify the local time zone offsets. * Because the contents of this NMEA message do not change significantly during a 1-second interval, the receiver outputs this message at a maximum rate of 1 Hz. 33
