2-6
Following completion of the tests, the
Satellite Bar Graph Page will be
displayed and the GPS 95 will begin
acquiring satellites.
After a position is found (and if no keys
have been pressed), the Position Page
will be displayed and the unit is ready for
normal operation. The process of
satellite acquisition is fully automatic
and, under normal circumstances, will
take approximately 2-3 minutes to obtain
navigation information. (If the unit has
been used in the past hour, it may take as little as 15 seconds.) If the GPS
95 has been moved a considerable distance since it was last used, additional
time may be required as the unit performs an AutoLocate
TM
. AutoLocate
TM
will automatically locate satellites and compute your position regardless of
your location or where the unit was last used.
When four or more satellites with good geometry are available, the GPS 95
will automatically operate in the 3D mode in which latitude, longitude and
altitude are computed. If only three satellites are available, the unit will
operate in 2D mode in which only latitude and longitude are computed. When
operating in the 2D mode, the unit will use the last computed altitude or your
last entered altitude. (Section 5.4 describes how you may enter the altitude.)
Your GPS 95 will automatically update satellite orbital data as it operates. If
you have not operated your unit for a period of six months or longer, it will take
approximately 15 minutes to search the sky and collect new orbital data. You
will be informed when your unit is searching the sky with the message
“Searching the Sky.” Once satellite orbital data is collected, it will be stored
in memory. The memory is maintained by an internal battery, therefore the
data will not be lost when you turn your GPS 95 off or remove the battery
pack.
