NorthStar 951X Installation Manual page 43

Problem Area
DGPS
(DIFFERENTIAL)
DGPS (cont'd)
951/952 INSTALLATION MANUAL Revision B
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Table 2: Troubleshooting the installation (continued)
Symptom
There's no DGPS indicator on the display
screen, and:
The BEACON RX SELF-TEST message
FAILED (
says press the
access the USER CUSTOMIZATION
screen, then press the
0$7,21
menu key to display the SER-
VICE INFORMATION screen).
There's no DGPS indicator on the screen,
and:
The BEACON RX SELF-TEST message
PASSED (
reads press the
access the USER CUSTOMIZATION
screen, then press the
0$7,21
menu key to display the SER-
VICE INFORMATION screen), and the
DGPS STATUS
message reads
ING
326,7,21
(press the
GPS POSITION
the
'*36 ,1)2
key to display the
STATUS
screen).
There's no DGPS indicator on the screen,
and:
The BEACON RX SELF-TEST AND SOFT-
WARE reads PASSED, and the DGPS
STATUS message reads OLD CORREC-
.
TIONS
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Possible Solutions/Reasons
•
67$5
key to
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6(59,&( ,1)25
•
•
•
67$5
key to
6(59,&( ,1)25
•
SEARCH-
key to access
screen, then press the
DGPS
•
•
•
•
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SECTION TWO - Installing the unit
Wait 30 minutes after start-up (only if
a new unit).
Check for an open or shorted bea-
con-antenna cable connector.
Check for proper ground (8410 only).
The Northstar 8410 ACU or the differ-
ential circuit board may be defective;
call your Northstar dealer or the
Northstar Service Department.
Wait 30 minutes after start-up (only if
a new unit) so the receiver can find a
differential transmitter within range)
check local knowledge or transmit-
ters).
Check for high noise level, possibly
due to a storm front, or for local inter-
ference at the marina or on the ves-
sel. For details about noise-level
meanings, see the Northstar 951/952
Operator's Manual (GM1500C).
Turn off power to each and all of the
vessel's other instruments, one at a
time, to isolate the source of the inter-
ference.
Try manually selecting and setting a
DGPS beacon station to be used to
see if the signal can be received.
Consult the Coast Guard's Local
Notice to Mariners to determine if
there's a scheduled maintenance out-
age for the station you're trying to
use.
For additional guidance, call your
Northstar dealer or the Northstar Ser-
vice Department.
No DGPS corrections have been
received, and the system has
returned to non-differential operation.
You may be out of range of a trans-
mitter, or if you're experiencing bad
weather, noise may be interfering. In
either case, you must wait.
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