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GSM19 Series Magnetometers - Version 7
GEM Systems, Inc. Advanced Magnetometers
For more technical information, visit www.gemsys.ca
NOTES:
The message “please wait for pps” may not be visible with some GPS boards (i.e.
AllSTAR with WAAS). Instead, you will notice that there may be a because the
magnetometer will wait for a minimum of 3 satellites before synchronizing time.
The time to achieve GPS lock may vary due to sky visibility, weather conditions,
and it is also affected by the satellite parameters stored in the GPS module during
the previous surveys. Turning off the GPS in Canada and back on in Europe
increases the time to lock since new satellites must be tracked. The PPS signal is
generated when enough satellites are "in view" to produce a good GPS solution.
The GPS initialize command has been added to the GPS menu only for
convenience. Before starting (or re-starting) a survey with the GPS enabled, the
GPS module is automatically initialized. The survey does not proceed until
achieving lock condition. Normally, there is no need to manually initialize the
GPS.
D2. SYNCHRONIZING GPS TIME
Select
C-synch-to-UTC
to manually synchronize the internal timer to UTC (Universal Time
Coordinate) or GMT (Greenwich Meridian Time). After detecting PPS, the unit shows:
SCREEN D5
Synchronizing to UTC
Coordinated Universal Time
Now the internal clock is synchronized to GPS UTC time
NOTE:
The synchronize to UTC command has been added to the GPS menu only for
convenience. Before starting (or re-starting) a survey with the GPS enabled, the
unit automatically synchronizes to UTC. The survey does not proceed until
achieving lock condition and synchronizing the time.
With GPS enabled, the internal timer is always overwritten. It is not possible to
run a GPS survey with other than UTC.