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79Northstar Explorer 657 Installation and Operation Manual
Restart GPS:
Restarts the GPS receiver, satellite reception will
be lost until the receiver completes its restart and
acquires the satellites.
!
WARNING
MOB will not work if the Instrument does not
have a GPS fix.
Select restart GPS and press
Installing an antenna
If an external antenna is required, install the
antenna and fit the antenna cable back to the
display unit. Follow the instructions in the manual
supplied with the antenna. Fit an optional
Northstar extension cable if required.
If a SmartCraft™ system or Northstar petrol/
gasoline sensors are fitted as well, fit a AIS cable:
GPS antenna
Other connections
Yellow
Yellow
GPS/fuel AIS cable
White
Otherwise:
GPS antenna
Yellow
During setup, configure the 657 for the chosen
antenna, see section 17-4.
18-5 Installation: GPS antenna
Selecting an antenna
Fit one of these GPS antennas:
• Normally use the GPS antenna supplied.
• An optional differential beacon DGPS
antenna to give enhanced accuracy within
range of land based differential beacons
in areas where WAAS or EGNOS are not
available. Such a DGPS antenna has both a
GPS receiver and a beacon receiver, and it
automatically applies the beacon correction
to the GPS position.
• A compatible GPS or DGPS instrument or
antenna connected by NavBus (see section
18-9) or NMEA (see section 18-10). In this case,
the 657 does not need its own antenna.
Note:
• To configure the 657 for different antenna
options, see section 17-4.
For more information, contact your Northstar
dealer.
DGPS Source:
Enables or disables the satellite based DGPS
correction (see section 7). The options are
None or WAAS/EGNOS. Do not Enable
WAAS/EGNOS outside their coverage areas or the
accuracy of the position might be degraded.
WAAS covers all of the USA and most of Canada.
To use WAAS, the GPS antenna must have a clear
view of the sky towards the equator. EGNOS will
cover most of Western Europe.