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True Grid Mode
GPS TrackMaker® can view data in True Grid Mode. This view mode is enabled when the True Grid button
is selected.
In True Grid mode, when the program verifies that screen limits are in a same zone, it will internally change the
whole visualization structure, modifying the screen for True Grid Mode, doing the conversion of all data on the
screen for the respective rectangular system. The indication TRUE will appear in left side of the status bar at the
bottom of the screen, together with an icon
Thus, all Waypoints, Tracklogs and Routes coordinates, will first be converted to the rectangular system and then
they will be shown on the screen or printer.
The great advantage of True Grid mode is to facilitate a greater precision in data visualization on the screen,
without deformations created by Meridian Convergence. In rectangular systems, scanned and inserted maps in the
background of the screen will also be more precise for Waypoints, Tracklogs and Routes.
The advantages of True Grid Mode are:
•
Facilitates the visualization and data handle more precisely regarding in normal mode. The deformations
created by Meridian Convergence are eliminated.
•
Scanned Maps in rectangular systems inserted in the background of the screen will have greater precision.
Disadvantages:
•
True Grid Mode becomes slower, because all data is converted to the respective rectangular system before
being displayed.
•
It will be activated only when there is just one zone on screen.
Comparison between Normal Mode and True Grid Mode
Expanding Zones
GTM PRO® has a resource called Expand Zones allowing to expand a single rectangular zone, extrapolating
the limits of the True Grid mode. For further information, see
.
The illustration indicates the difference displayed between Normal Mode
and True Grid Mode. Notice that the display in Normal Mode presents a
small rotation created by the Meridian Convergence (Grid Declination).
In True Grid Mode, there isn't any rotation.
104
Expanding
Zones.
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