NorthStar Navigation GM1708 961XD - Manual (Page 47)

SECTION TWO - Installation
961 INSTALLATION MANUAL Revision A Page 37
DGPS (cont’d) There’s no DGPS indicator on the Chart
screen, and:
The BEACON RX SELF-TEST AND SOFT-
WARE message reads
PASSED, AND
THE DGPS STATUS
message reads
SEARCHING
.
• 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. See the Northstar 961 Operations
and Reference Manual (GM1700) for
details about noise-level meanings.
• 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 may be a scheduled mainte-
nance outage for the station you’re
trying to use.
• For additional guidance, call the
Northstar Service Department.
DGPS (cont’d) There’s no DGPS indicator on the CHART
screen, and:
The BEACON RX SELF-TEST AND SOFT-
WARE reads PASSED, and the DGPS
STATUS message reads OLD CORREC-
TIONS
.
• No DGPS corrections have been
received, and the system has
returned to non-differential operation.
You may be out of range of a transmit-
ter, or if you’re experiencing bad
weather, noise may be interfering. In
either case, you must wait.
DGPS (cont’d) There’s no DGPS indicator on the CHART
screen, and:
The BEACON RX SELF-TEST AND SOFT-
WARE reads PASSED, and the DGPS
STATUS
message reads POOR DOPS
.
• Wait for the satellite configuration to
automatically update, which should
only take a few minutes.
DGPS (cont’d) There’s no DGPS indicator on the CHART
screen, and:
BCN UNHEALTHY is displayed.
• Wait—the transmitter is switching to
another beacon. You can try manually
switching to another transmitter.
Table 2: Troubleshooting the installation (continued)
Problem Area Symptom Possible Solutions/Reasons