Thales Navigation Mobile Mapper - Manual (Page 23)

17
8. Offsetting a Line or Area Feature
For the same reasons as a point feature (see previous
page), you may need to use the offset utility to map a line
or area feature. By combining the receiver’s position
with the direction and the distance to the feature,
MobileMapper will automatically calculate and record
the location of the feature.
To input an offset for a line or area feature, assuming the
Feature List screen is now displayed, do the following:
- Highlight one of the features available from the open
feature library and press ENTER.
- Press MENU, highlight Offset and press ENTER. This
displays the Line or Area Offset screen on which you
should enter the following parameters:
Direction : Location of the feature with respect to your
actual path. To input a value for Direction , press
ENTER, choose one of the two options (Right or
Left) and press ENTER again. Press the down arrow
to move the cursor to the next field.
Horz. Distance : Horizontal distance to the feature from
your current position. To input a value for Horz. Dis-
tance , press ENTER and increment or decrement the
highlighted number using the up/down arrows. To
edit another digit, use the left/right arrows. When you
are done, press ENTER again. Press the down arrow
to move the cursor to the next field.
Vert. Distance : Vertical distance to the feature from
your current position (“0” if the feature and yourself
are at the same elevation -on a flat area). Enter a
value for
Vert. Distance as described above for Horz. Dis-
tance . When you are done, press ENTER again.
- Then press ESC to return to the Logging screen. This
writes the offset into memory, but you can edit it later
if you like by going through the same process. If you
close the feature and return to the Map screen, you
will see that the feature is offset from your position in
the middle of the screen.
Line or Area Offset
screen
Visual estimation for
horz. & vert. distances is
usually good enough in
terms of accuracy.
On the left On the right
Line Area