24. Recording Functions
24-5
24.4.4 Recording positions
The operator may manually save positions to the Voyage log in various ways. These are:
• Direct sensor position (GPS, Loran, etc.)
• 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.)
DGPS-1st
60
°
19.222'N
027
°
00.404'E
An example of saving direct position or position calculated by the system
FURUNO
60
°
19.222'N
027
°
00.404'E
An example of saving position based on operator observation
First you should locate the position of your observation on the ECDIS 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. Select
appropriate method from the Device list box. In case a User Observation is selected, put the cursor on the desired
location on the ECDIS display then press the left mouse 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.
To Next Page
Loading...
