GPS TrackMaker Reference Manual page 101

Rectangular Systems
UTM Coordinate System
UTM: GPS TrackMaker® allows the visualization of data in True Grid mode. More information, see
Mode
The UTM system was created to determine the rectangular coordinates in military charts, in large scale, for the
whole world. It is a practical method to calculate the transformations of plane coordinates in geographic and vice-
versa, or the conversion of plane coordinates on the ellipsoid according to ellipsoidal sides and angles, or the
calculation of the meridian convergence and of the azimuths and plane and ellipsoidal sides.
The UTM systems determines that the Earth is divided in zones, limited by 60 sections of 6 degrees of longitude,
with its origin in Greenwich anti-meridian (180º), and growing from west to east until its union at this same point.
For the extent in latitude, the section begins in 80ºS parallel going up to the 84ºN parallel. For the longitude, there
are 60 sections, for latitude, the division corresponds to zones of 4º. A number followed by a character, as shown
below, represents each zone:
Example : The coordinates -19,9478667572357 and -43,9863802100454 (dd.ddddd) represent in UTM :
Zone 23K, horizontal coordinate S7794181,82477, Vertical coordinate W606056,63507
(Conversion made in WGS 84 datum)
The character W, E, S and N are only indicatives and will be discarded if User inserts them.
The program shows at screen up to 4 consecutive zones, giving a global view. Above 4 zones, the program will
show only the meridians and the separation parallels of each zone in red color.
LTM and RTM Coordinate System
LTM system (Local Transverse Mercator) and RTM system (Regional Transverse Mercator) are available
only in GTM PRO®, and they are used basically in specialized works of topography and geodesy.
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True Grid