NorthStar Navigation Explorer 660 - Manual (Page 53)

Northstar Explorer 660 Installation and Operation Manual 53
15-4 Setup > GPS
Press MENU once or more until the Setup menu
is displayed, then select System:
GPS Source
There are two options:
• NMEA: Use the external GPS antenna
supplied or an external GPS or DGPS source
connected via NMEA (see section 16-6).
• NavBus: Use an external GPS or DGPS source
connected via NavBus (see section 16-6).
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 WASS, the GPS antenna must have a clear
view of the sky towards the equator. EGNOS will
cover most of Western Europe.
Static Navigation
When the boat stops or moves very slowly, the
calculated GPS speed and course become erratic.
Static navigation is a number, and the options are:
• 0.01 to 99.9: If the boat speed is slower
than this, the speed is displayed as zero and
the course stays unchanged.
• 0 (Off): The calculated speed and course
are always used.
Speed and Course Filter
Waves and wind cause the boat, speed and
course to fluctuate slightly. To give stable
readings, the Explorer 660 calculates these values
by taking several measurements and averaging
them.
A lower value averages measurements over
a shorter period of time. This gives the most
accurate value but has the most fluctuations.
A higher value averages measurements over
a longer period of time. This gives the most
stable value but will ignore some true speed
changes.
Set the Speed and Course filters to the lowest
values which give stable readings. The range of
each filter is 1 to 60 seconds or Off (0).