bca Tracker DTS Instruction Manual page 5

4) Verify the smallest distance/strongest signal by maintaining the Tracker's orientation and moving
it perpendicular to the point where the smallest reading is captured. More brackets can be performed
until the lowest number is found. This is identical to pinpointing with an analog/audible-based beacon.
When bracketing, however, it is important only to concentrate on the numeric distance readings; directional
arrows should be ignored.
5) Begin probing at the smallest number found. We suggest an expanding spiral pattern.
Pinpointing on a line
1) It can be helpful at this point to introduce the concept of "pinpointing on a line." If the searcher
can establish a straight search path before entering the pinpoint phase, the bracketing process can be
minimized. Once a straight line has been established, draw a line in the snow or place a long object
(such as a probe or ski) on the snow, starting at about three meters. This enables them to limit the pinpoint
search to that axis. A physical object on the snow also provides a reference point to which they can return
if they become confused.
2) The key to pinpointing on a line is to establish an accurate line. Depending on the distance and
direction from which you approach the buried beacon, and the orientation of that beacon, the flux line
might be curved when approaching the three-meter mark. If so, back up several meters and approach from
a different angle. This can be done several times until a straight approach is established (Figure 1).
3) Once the lowest distance reading is located on this line, it is helpful to bracket once to see if a lower
reading can be attained on either side. This will provide for a more precise pinpoint search if the line
wasn't determined precisely the first time.
4) For more precision in deep burials, it is best to first identify the "spike" reading(s), then establish the
line, rather than establishing the line at three meters. This is described in the Advanced Tutorial.
Exercise I: Exposed transmitter/supervised
Have each student conduct a secondary and pinpoint search for the transmitter on the snow surface. By
leaving the transmitting beacon visible, the student will build confidence.
-Tracker DTS Instruction Guide -
Establish pinpoint
line here
spike
reading
4
Bracket
Bird's-eye
(optional)
view
Bird's-eye
view
lowest spike
reading reading