MTD2000 AT Command Guide R12
Confidential
DAVISCOMMS (S) PTE LTD
102 /105
mm = minutes
dddd = decimal part of minutes
<E|W>
Either character E or character W, E = East, W = West
s.s
Speed, knots
h.h
Heading
ddmmyy
Date
dd = date
mm = month
yy = year
d.d
Magnetic variation
<E|W>
Declination. Either character E or character W, E = East, W =
West
M
Mode indicator
A=autonomous GNSS fix
D=differential GNSS fix
E=estimated/dead reckoning fix
N=no fix
Example:
$GPRMC,134829.486,A,1126.6639,S,11133.3299,W,58.31,309.62,110200,,,A*14
26.1.7
ZDA – Time and Date
Outputs the current UTC time and date. Unlike other messages, the time output by this
message is bound to GPS Recevier’s internal real-time clock (RTC) and thus it is
updated even when navigation fix is unavailable. The RTC time is maintained also
while the module is in sleep mode.
Note:
The time output in ZDA message slightly differs from the time output by other
messages because the time reference of the ZDA message is set to the very instant
of outputting the message, whereas the time output on other messages is the
moment of the navigation fix.
As the ZDA time is set to output time of the message, this time is closer to the real
time and may be used as a somewhat accurate time reference if the latency of the
system-specific serial port transmission is compensated (usually
about
deterministic). Time precision of approx. 1/100th of a second can be achieved by this
method.
Syntax:
$GPZDA,hhmmss.dd,dd,mm,yyyy,xx,yy*hh
hhmmss.dd
UTC time in hours, minutes, seconds and fractions of a second
dd
UTC day of month
mm
UTC month
yyyy
UTC year