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9
NaviTrack
®
II
Tracing line (Lower Antenna Signal) – shows the
apparent direction of the field as detected at the lower
antenna.
Display Elements: Passive Trace Mode
The screen elements in Passive Trace Mode are the
same as those seen in Active Line Trace mode.
NOTE! Mode is determined by the type of target source
(Sonde or Line). For example, selecting the
512 Hz frequency from the Sonde mode section
of the frequency menu puts the SR-20 into
Sonde mode. (A frequency must be selected
from the correct category if it appears in more
than one category, such as 33 kHz).
Default Frequencies
The Master Frequency Menu contains a large set of fre-
quencies, but only some of these are made currently
available. They are made “Currently Available” by check-
ing them in the Master Frequency Menu,
as described on
page 23
. The frequencies which are currently available ap-
pear on the Main Menu when the Menu Key is pressed.
“Currently Available” frequencies can be checked in the
Main Menu, in which case they will appear when using the
Frequency Key. If they are unchecked in the Main Menu,
they will not appear when using the Frequency Key to
cycle through frequencies. Frequencies which appear in
the Main Menu and are checked for activation are called
“Checked-Active”.
Frequencies that are “Checked-Active” can be cycled
through simply by pressing the Frequency Key
(See Fi-
gure 9)
. A frequency chosen by pressing the Frequency
Key becomes the “In Use” frequency.
Currently available frequencies in default setting include:
Sonde Mode
• 512 Hz
Active Line Trace Mode
• 128 Hz
• 33 kHz
• 1 kHz
• 8 kHz
• 262 kHz
Passive Line Trace Mode
• 60 Hz (Power)
The use of these features is described in the Sonde
Locating, Active Line Tracing, and Passive Line Tracing
sections.
Keypad
Figure 9 – Keypad
Power ON/OFF – Powers NaviTrack II ON. Powers
the NaviTrack II down after a 3-second countdown. The
countdown can be interrupted before shutdown by press-
ing any key.
Up and Down Arrows – Used for locating choices
during menu selection; used for setting the Volume
Control when the Sound Key has been pressed.
Select Key – Used to make a choice during Menu
selection; in normal operation, used to force a Measured
Depth reading and re-center audio tone. Can be used to
force a depth display. Sets volume level in Sound menu.
Menu Key – Used to display a “tree” of choices in-
cluding frequency selections, display element choices,
brightness and contrast, and restoring default settings.
Within a menu, press to move up one level.
Volume Key – Used to raise or lower the volume
setting; will cycle the volume from current setting by
steps, increasing to maximum and then off. Pressing the
volume key opens the volume control panel if it is closed,
and closes it if it is open. Volume can also be raised and
lowered using the Up and Down Keys when in the
Volume control panel.
Frequency Key – Used to set the “In-Use” frequency
of the NaviTrack II from the set of checked-active fre-
quencies. The list of frequencies that have been set to
Checked-Active status can be modified via the Menu
Key. Frequencies are grouped into three sets: Sonde
Frequencies ( ), Line Trace Frequencies ( ) and
Power Frequencies ( ). Each press of the Frequency
Key cycles to the next Checked-Active frequency.
Light Sensor – Detects light levels and controls the
LCD backlight, which is set to come on under fairly
dark conditions. The backlight can be forced on by cov-
ering the sensor with your thumb.
Volume Control
Key
Down Key
Menu Navigation
Menu
Key
Select Key
Menu Item Select
Up Key Menu Navigation
Frequency Key
Light
Sensor
Power
ON/OFF
Key