Position Events - Furuno FCR-21x9-BB Operator's Manual

19. RECORDING FUNCTIONS
19.1.2

Position events

The operator may manually save positions to the [Event] log by position or LOP (Line
of Position:
To record a position, do the following.
1. First you should locate the position of your observation on the display. Put the cur-
sor on the desired location on the chart display then click [Record], [Event Log]
and [POSN Event] on from the InstantAccess bar to show the [Position Event] di-
alog box.
2. At the list box at the top of the dialog box, select position type.
[LOP]: Latitude and longitude position of a fixed object at ship's position.
[Position]: Ship's position fed from navigator selected.
3. For [Position], click the [Record] button to save the position observation into the
[Voyage] log.
4. For LOP, see the description below.
Position fixes defined by Line of Position (LOP)
A plotted line on which a vessel is located, determined by observation or measure-
ment 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 "esti-
mated position" (EP); otherwise it is called a fix. 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 box-
es or they can be selected graphically on the chart. Click on a charted object (beacon,
light, buoy etc.). Description of the object appears above coordinate boxes.
Default values for bearing and range are approximated from ship's current position in-
formation. The time of observation is stopped when the object is selected (or when the
[Add] button is clicked). Click the [Add] box to include the observation in the fix com-
putation. The counter shows "new/1", and a second observation may be entered. The
word "new" indicates that the observation currently displayed is not yet included in the
fix computation, and it appears as a dashed line or ring on the chart. The added ob-
servations can be edited or deleted after selecting them at the counter. When at least
two measurements are entered, the EP or fix is computed and the coordinates are
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