GPS Controls, Indicators, and Functions.
GPS control/display unit (fig 3-25A).
Line selection keys. Four line selection
keys, located to the left of the CDU display screen, are used t
initiate and terminate data entries and to select various system
Display screen. system information is
shown on the cathode ray tube display screen. The display
screen can show four lines of text with 13 alphanumeric
characters on each.
Mode selector switch. The four-
position mode selector switch, placarded PULL OFF, INIT,
NAV, and PULL TEST, is used to select the operating mode
of the GPS system.
Display brightness control. A control
knob placarded BRT is provided to control the brightness of
the cathode ray tube display screen. Clockwise rotation of the
control increases brightness.
Data entry keys (0 through 9). The
data entry keys are used to enter alphanumeric data.
USE LTR key. The use letter key,
placarded USE LTR, is used to select alphabetic prompt in
free format data entry. The USE LTR key terminates
alphabetic entry when pressed.
Clear key. The clear key, placarded
CLR, is used to clear erroneous data entry and message
Slew key. The slew key is used to
access additional pages within a data display selected by the
data selector switch. If more than one page is available, a
double arrow is displayed in the lower right corner of the
display. Pressing the slew key will access the next page.
Repeated pressing the slew key will return the display to the
first page after the last page has been accessed.
Data selector switch. For all data
selector switch positions there are two modes of displayed
Pressing the WP key switches the CDU
between the two modes.
Destination mode (active waypoint
Waypoint (WP) examine mode
The 10 position data selector switch is used to select the type
information to be displayed on the CDU as shown in Table 3-
Table 3-5A. Data Selector Switch Positions
Position data is displayed.
Mission data is displayed.
Option data is displayed. Six pages of information pertaining to the GPS receiver
are made available when the OPT position is selected.
Status data is displayed.
Magnetic variation and map datum data is displayed.
Error data is displayed.
Wind data is displayed.
Distance and time to go data is displayed.
Track and ground speed data is displayed.
Desired track and vertical angle data is displayed.
Change 5 3-76A