Si-tex SNS-1100, User Manual, Page: 53 / 114

User Manual -
53
Compute Correction Corrects fixes from the positioning instrument. By
placing the cursor on the ship’s real position and
selecting this option, the error is calculated and
internally memorized for appropriate correction, but
not applied.
Correction Offset Manual correction of fix position.
Static Navigation1 Sets up a threshold for the speed. When the speed
received from the positioning device is under that
threshold, the chart plotter displays zero speed.
Position Filter Turns On/Off the Position Filter. In case of a jittering fix
this option makes the ship’s position more stable and
the track smoother.
Speed Filter
Turns On/Off the Speed Filter. When it is On, you can
filter the speed of the ship, to optimize it.
Bearing Selects either degrees magnetic, Auto Mag, or True.
If magnetic readings are selected the variation is
computed automatically for every zone as soon as the
chart is displayed.
Magnetic Variation It is possible to calculate the Magnetic Variation in an
automatic or manual mode, by inserting the step for
calculation of Magnetic Variation.
Calibrate Compass The variation table is used to match magnetic value
readout on the chart plotter comparable with the value
given by the compass of the boat. In other words, since
the compass of the boat must be compensated (due
to the iron masses, ...), we use the same values given
by the chart plotter. This means that, for example, if
the BRG to the next Waypoint readout in the chart
plotter display is “X” Mag degree, if you steer the boat
reading “X” Mag degree from the compass, you are
driving well toward the next Waypoint.
NOTE1 Not Available SNS 700e/SNS 700i/SNS 700fe/SNS 700fi.
3.7 AIS
AIS is an Automatic Identification System. It has been introduced to improve the safety of navigation
by assisting in the efficient operation of ship-to ship, ship reporting and VTS applications. The
system should enable operators to obtain information from the ship automatically, requiring a
minimum of involvement of ship’s personnel, and should have a high level of availability. AIS
transponders installed on IMO vessels use VHF frequencies to:
• Transmit details of their own vessel
• Receive details from other vessels or navigation aids within VHF range.
Information being transmitted from vessels over 300 tons that, due to recent worldwide
legislation, are required to fit Class “A” AIS transponders.
Connecting to the chart plotter an AIS receiver (please contact your local dealer), vessels with
AIS transponder within VHF range are displayed on screen giving the skipper or navigator a
visual interpretation of the data of nearby vessels. This improves safety, and specifically for
collision avoidance reasons.