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Northstar M121/M84 Installation and Operation Manual 79
19-5 Setup > GPS
Press
MENU
twice, then select GPS:
GPS Source
• NMEA: Use the external GPS antenna
supplied or an external GPS or DGPS source
connected via NMEA (see section 20-11).
• NavBus: Use an external GPS or DGPS
source connected via NavBus (see section
20-10).
DGPS Source
Refer to section 20-5
Restart GPS
Refer to section 20-5
Static Navigation
When the boat stops or moves very slowly,
the calculated GPS speed and course become
erratic. Static navigation allows the erratic
values to be filtered:
• 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 Instrument 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