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Problem Possible Cause Action
Unit does not
power on
If using battery:
Dead battery
Recharge battery
If using AC power
supply: bad power
supply
Check operation
with battery or a
known good power
supply
No GPS signal
reception
Obstructed signal
path
Move aircraft out
of hangar or away
from buildings to
provide an
unobstructed view
of the sky for the
antenna
Incorrect seed
position, time, or
UTC differential
entered
Check these
settings, if
necessary
Unit in simulator
mode
Select “Aviation”
mode in the
“Usage” function in
System Setup
If using an external
antenna: faulty
external antenna,
wiring, or
connections
Contact your
dealer to check the
antenna and other
wiring
Display too dark or
too light —
characters hard to
see
Change in viewing
angle or ambient
light conditions
Adjust display
backlight or
contrast
Search for nearest
waypoints reveals
too few or wrong
types of waypoints
Incorrect selection
of waypoint types
to show after
search
Check “Map
Setup” function
and verify that the
desired waypoint
type to search is
“ON”