[time-nuts] GPS SPD field

Randy Warner Randy at synergy-gps.com
Tue Aug 8 15:12:09 EDT 2006


Joe,

The decimal should stay in the same place. Places to the left of the
decimal will naturally grow as needed to handle the calculated value.
Most all NMEA data fields will adjust to handle the data, but different
manufacturers handle the details differently. Some will default to all
null fields when first turned on: $GPRMC,,,,,,,,,,*XX, while some will
fill the fields with zeroes: $GPRMC,000000.00,V,0000.0000,N ---- *XX.

Makes life a little more interesting if you are writing a parsing
routine.

Randy

 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Joe McElvenney
Sent: Tuesday, August 08, 2006 11:03 AM
To: time-nuts at febo.com
Subject: [time-nuts] GPS SPD field

Hi,

   Reference a Rockwell Jupiter GPS receiver.

   Does anyone know if the decimal point in the NMEA $GPRMC 'SPD'
ASCII field moves around? At rest it reports 0.000 but it is not obvious
whether this format is maintained on the move or expands/contracts to
suit. Does it keep the same precision with the most significant digits
expanding or not?


   TIA - Joe


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