G-858BP Backpack Mag
Operators Manual
Multi-Grid Surveys
As seen above, horizontal locations are limited to grid lines. However, you can change the grid, even
in the middle of a survey. This is useful if you want to fill-in parts of a survey with finer spaced lines, or
take lines in different directions.
Note:
The current grid is used for the automatic tracking of positions, and to
define the display extents and fiducial points of the map.
From the Ready state, press ESC to bring up the Mapped Survey Main Menu. Then select DEFINE
MAP. Make the changes you desire, then select CONTINUE SURVEY from the Mapped Survey Main
Menu. Press the MAP key to bring up the map, and position the cursor where you desire. Then bring back
the acquisition display (press ESC from the map). Pressing the MARK key will begin data storage.
Note:
Novices to the G-858BP should not attempt this procedure. Another
way to do this is to define a new file number, as if this were an unrelated
survey. Data can then be located and edited separately, and combined in a
program such as Surfer for Windows.
Warning:
You may not be able to edit positions in MagMap2000 when using
a multi-grid survey. If you use this function, make sure you get the positions
correct on the G-858BP. You must use the NOEDIT method within
MagMap2000 in order to locate surveys in which the lines are not parallel.
Note:
The map display will only show the current grid. Thus, you may not
see data points which were gathered in previous grids. In order to see all of
your data points, you could re-define the grid to contain the entire area of
interest.
Example 1: Filling in more lines
Suppose you have completed your survey and desire to fill in more lines over a certain portion.
Consider the survey shown below.
62
