Garmin G1000 Maintenance Manual page 81

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5.6.2 GPS
Symptom
Will not acquire satellites
G1000 System Maintenance Manual
190-00907-00
Recommended Action
•
Ensure that a cell phone or a device using cell phone technology
is not turned on (even in a monitoring state) in the cabin.
•
Check for possible external interference to the GPS receivers.
−
Ensure that a cell phone or a device using cell phone
technology is not turned on (even in a monitoring state) in the
cabin.
−
Turn to the GPS page on the MFD and check the GPS
strength bars on both GPS receivers. If the signal strength
level is erratic, or they disappear and reappear rapidly, or
switch between a solid and hollow bar frequently there is an
external device interfering with the GPS receivers. Turn off
any devices that radiate a signal in the local area or move the
aircraft to another location to remove the interference.
•
Check date and time on Date/Time Setup Page.
−
If date and time are incorrect, enter the correct date and time.
•
Switch GIA1 and GIA2, to verify location of problem:
−
If problem follows unit, clear the GPS almanac by performing
the following steps –
Using the PFD in config mode, go to the GIA RS-
232/ARNIC 429 Config Page.
At the top of the screen, select the GIA that can not
acquire satellites (GIA1 or GIA2) and press the ENT key.
Press the "CLR NV" softkey at the bottom of the screen.
Select "OK" in the "Clear GIA nonvolatile memory?" pop-
up window.
Next reload GIA Audio and Config files from a loader
card, see Section 7 for instructions. Be sure to reload the
config files for any optional equipment installed on the
aircraft that require the GIA config to be updated.
•
Cycle power on the system and allow it to restart in normal mode.
Place the aircraft outside and allow 15-30 minutes for the GPS to
acquire a position and download a new almanac.
−
If clearing nonvolatile memory is unsuccessful and the GPS
still can not acquire a position, replace the GIA.
•
If problem does not follow unit, check GPS antenna and cabling.
Page 5-45
Rev. B