Garmin GPS 400 Pilot's Manual And Reference page 13

The land data page will appear next, followed by the database confirmation page,
which shows the current database information on the NavData card (with the valid
operating dates, cycle number and database type indicated). The database is updated
every 28 days, and must be current for approved instrument approach operations.
Information on database subscriptions is available inside your GPS 400 package.
To acknowledge the database information, press the
Once the database has been acknowledged, the satellite status page will appear,
and the GPS 400 will begin to collect satellite information. An ' A cquiring' status will
be displayed on the satellite status page, and the signal strength of any satellites
received will appear as "bar graph" readings. This is a good indication that you are
receiving signals and a position fix will be determined. Following the first-time use
of your GPS 400, the time required for a position fix will vary—usually from one to
two minutes.
If the unit can only obtain enough satellites for 2D navigation (no altitude), the
unit will use the altitude provided by your altitude encoder (if one is connected).
If the GPS 400 has not been operated for a period of six months or more, it may
have to 'Search the Sky' to collect new data. This means the unit is acquiring satel-
lite data to establish almanac and satellite orbit information, which can take 5 to 10
minutes. The satellite status page will display a 'Search Sky' status, and the
message annunciator (MSG), above the
system message, 'Searching the Sky'.
To view a system message, press
The message page will appear and display the status or warning information
applicable to the receiver's current operating condition.
To return to the previous page after viewing a message, press
E
key.
M
key, will also flash to alert you of a
M
.
M
The satellite status page shows the ID num-
bers for the satellites and the relative signal
strength of each satellite received (as a "bar
graph" reading.
'Search Sky' indicates that satellite almanac
data is not available or has expired (if the
unit hasn't been used for six months or more).
The data will be recollected from the first
available satellite.
The 'INTEG' annunciator (bottom left corner
of the screen) indicates that satellite coverage
is insufficient to pass built-in integrity moni-
toring tests. In the example above, not enough
satellites are being received to determine a
again.
position.
TAKEOFF TOUR
Acquiring Satellites &
Viewing Messages