Furuno FCR-2107 series, Operator'S Manual

Page: 393 / 556

16. Recording Functions
16-5
Recording positions
The operator may manually save positions to the voyage log in various ways. These are:
•
Direct sensor position
•
Positions calculated by the system (in example below such are Kalman filter and Dead reckoning)
•
User observations. (Visual, astronomical and MFDF. MFDF is Medium Frequency Direction Finder.)
An example of saving direct position or position calculated by the system
FURUNO
An example of saving position based on user observation
First you should locate the position of your observation on the chart radar chart. Use, for example, the two separate
EBL and VRM available in the Nav Marks dialog box. Open the Sensors dialog box then click the Record tab.
Choose appropriate method from the Device list box. Place the cursor on the desired location on the chart radar
display then press the left
button. The latitude/longitude position of the cursor is then copied to the Lat and Lon
fields. If you are satisfied, then click the Record button to save the position observation into the voyage log. If you
wish you can also enter Lat and Lon values manually.
Position fixes defined by Line of Position (LOP)
A plotted line on which a vessel is located, determined by observation or measurement of the range or bearing to an
aid to navigation or other charted element. Two or more simultaneous observations can be combined to produce an
estimate of the ship’s current position. If the position is based on only two observations, it is an "estimated position"
(EP); otherwise it is called a fix. Line of Position (LOP) can be found in the Sensors dialog, Record tab as one of the
Position Sources. A maximum of 6 observations can be entered to obtain a fix.
Basic operation: Coordinates of the aid to navigation can be entered into dialog boxes or they can be selected
graphically on the chart:
•
S57, click on a charted object (beacon, light, buoy etc.). Description of the object appears above coordinate
boxes.
•
ARCS: click anywhere in the chart.
Default values for bearing and range are approximated from ship’s current position information. The time of
observation is stopped when the object is selected (or when Add button is clicked). Click Add button to include the
observation in the fix computation. The counter shows "new/1", and a second observation may be entered. The word