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Getting Started
If satellites are scheduled to be in
view, the unit immediately starts
searching for them. Satellite re-
ceiver activity is monitored on the
2- page receiver status screen.
If there are not enough satellites
scheduled to be in view, the satel-
lite search and tracking algorithm
will not begin and the adjacent
screen is displayed. With the cur-
rent satellite constellation it is un-
likely you will ever see this mes-
sage.
The unit devotes all ten channels to the search for the satellite the almanac
indicates is directly overhead, given your last fix or initial position. This
generally takes a few seconds. If the satellite cannot be located, the unit
looks for the satellite with the next highest elevation. Searching for the
highest satellite greatly shortens the length of time required to obtain a
position fix.
Once the satellite has been located,
the receiver searches for other sat-
ellites that are scheduled to be in
view.
Throughout the search and acqui-
sition of satellites the receiver sta-
tus screen monitors the activity of
all ten channels. (You may also
access the receiver status screen at
any time with AUX 1.). Refer to the
following illustration to interpret
this screen.
When the unit is first turned on, the unit's internal clock is updated in the first
10 seconds of ephemeris data collection. Thereafter, the clock is updated
every few position fixes.
2-16
ProMARK X
WAITING FOR FIX
0 0 1 2 2 2 0 1 1 1
1 2 2 4 9 1 7 4 5 6
S S S S S S S S S S
NOT ENOUGH
SATS UP
WAITING FOR FIX
0 2 2 2 0 2 0 0 1 1
1 5 3 0 5 1 7 9 5 2
B S S S S D S S S S
RECEIVER STATUS
0 2 2 2 0 2 0
1 5 3 0 5 1 7
D T T B S T T I I D
1
2
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