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GPS provides the time (hour, minute, seconds) and date (day, month, year) over the NMEA messages. It also provides a week counter. This wraps around at 1024. T
by mlaretallack 8y ago
GPS provides the time (hour, minute, seconds) and date (day, month, year) over the NMEA messages. It also provides a week counter. This wraps around at 1024. The last time was about year 1999.
With most of the things I have used NMEA for (time sync), I did not use the weeks counter. However if there is any software that does use it, it needs to be able to handle the rollover.
- tonyarkles 8y agoThis is where you have to dig a little deeper. Your receiver outputs the date in the NMEA messages, but the satellite doesn't actually transmit year/month/day. The satellite transmits the week number and the number of seconds that have passed since the start of the week. In your case, the receiver could potentially output incorrect dates in the NMEA output when the week number wraps around.