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Selecting the
Offset option
Offset screen for
a point feature
If you do not have a
compass, you can use
MobileMapper Pro's
Compass screen to
determine the bearing
to the offset feature. If
you have been moving
for 5 to 10 seconds
along a straight line,
the Compass screen
will tell you your head-
ing. You can use this to
determine the bearing
to the offset feature.
CAUTION! The receiver
cannot determine
direction while station-
ary.
Visual estimation for
horizontal & vertical
distances is usually
good enough in terms
of accuracy.
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- Offsetting a point feature
Sometimes the feature you want to put on the map is in an
area of poor GPS reception or is not accessible. This is
when you can map the feature using the offset utility. By
combining the receiver's position with the bearing and dis-
tance to the feature, MobileMapper Pro will automatically
calculate and record the position of the feature.
To input an offset for a point feature, highlight Str Light
from the New Feature screen and press ENTER. To save
time, press the MENU button instead of describing the
feature. Select the Offset option. At the top of the Offset
screen is the Bearing field for recording the compass direc-
tion to the feature that you want to map. To input a value
for bearing, 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.
Later on you will need a compass to determine the bearing
to the offset feature. Press the down arrow to move to the
Horizontal Distance field. To enter a value press ENTER and
you will see that only one of the numbers is highlighted.
Press the up or down arrows until the number you want is
visible. Press the left/right arrow to move to the next digit
and use the up/down arrows to select a value, and so on.
When you have input the proper distance to the feature,
press ENTER to accept it.
You can then press the down arrow to move to the Vertical
Distance field. (You don't have to input a value for the pur-
pose of this exercise, or if the difference in elevation
between you and the offset feature is minimal.) When you
are done entering the proper value for the last field you
want to edit, press ENTER to accept this last value.
Then press ESC to return to the Logging: Str Light 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 streetlight is offset from your position in the middle of
the screen.
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