Specifications

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Two options are then prompted:
By Time: Select this option when you want to log a new
GPS position at regular intervals of time regardless of
the distance traveled since the last position logged.
After tapping this option, tap the desired time interval.
This takes you back to the Logging screen where you
can see the list of attributes pertaining to the feature.
By Distance: Select this option when you want to log a
new GPS position only after you have moved by a cer-
tain distance since the last position logged. After tap-
ping this option, tap the desired distance interval. This
takes you back to the Logging screen where you can
see the list of attributes pertaining to the feature.
- As you would for a point feature, describe the feature
by describing the different attributes pertaining to the
feature
- When the description is finished, you can start walking
along the line feature
- When you arrive at the end of the line feature, with
ProMark3 still displaying the Logging screen, tap
Done
to stop logging the feature.
The receiver determines the length of a line feature by
estimating the distance between successive points on the
line feature with the assumption that each point is on a
sphere of average Earth radius. The elevations of the
points are not factored into the equation. Thus the
receiver calculates the spherical distance rather than the
horizontal or slope distance between the successive posi
-
tions.
The Logging screen also
displays the distance trav-
eled since you started log-
ging the line feature, the
number of satellites cur-
rently received and the cur-
rent value of PDOP (see
also page 225).
Logging screen