G-858BP Backpack Mag Operators Manual
Scroll to the desired file number. Then select DELETE THIS DATA. You will be prompted with
a dialog box before the file is actually erased. You will not be able to recover any file that you have
deleted. Notice the warning message on the menu above for file numbers that have not been transferred. If
you have transferred data from this file, this message will not be shown.
Format Memory
Erases the entire data memory of the G-858BP. All data in all files will be lost. If the system
hangs up at some point, you may need to do this after power up to get the unit to behave properly.
Send Set Up
Intended for Geometrics Service and Test.
Receive Set Up
Intended for Geometrics Service and Test.
Chapter 10: GPS Programming
Overview
The G-858BP is designed to simultaneously acquire GPS positions while it is acquiring magnetic
data. The NovAtel Smart Antenna or Novatel Smart V1 with Omnistar GPS are preset at the Geometrics
factory to send the smallest possible $GPGGA position and time string in order to maximize memory
utilization. The magnetometer interface for logging the GPS position data is also preset, and so the only
requirements are that the user start the survey in either Simple Survey or Mapped Survey mode and the
GPS information will be automatically logged. The console is set up so that the GPS is not logged when in
Pause or at the End-of-Line. Again this is to maximize memory space.
The G-858BP may be programmed to send commands to the GPS receiver when certain keys are
pressed. All communication with the GPS takes place through the RS-232 port.
Note: Please remember that ASCII strings coming from a GPS unit take up a
lot of memory space. Select the smallest data format you can for maximum
data collection time. With a GPS unit sending a data string every 1 second in
NMEA GGA format, for example, and the G-858BP set to collect 10 readings
per second, the memory will be full after about 3.5 hours.
Collecting GPS Data
Most G-858BP magnetometers are equipped with a Novatel Smart Antenna GPS or Novatel Smart
V1 mounted on a backpack frame. These GPS units are cabled to the G-858BP logging console and pack
frame battery box. All necessary wiring connections are in the power cable supplied with the battery box.
The Smart Antenna is pre-configured by Geometrics to provide the $GPGGA NMEA sentence only.
Make sure that the RS-232 port is set to collect GPS data. This is done in the main System Setup
menu. Set the RS-232 port to DATA LOGGER. In addition, you will probably want to set the unit to store
GPS data only when in the acquire mode. This means it will store GPS data only when magnetometer data
is being stored. Therefore, between lines or when in PAUSE mode, no GPS data will be stored. This will
save memory, and typically you will not be interested in GPS data during those times.
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