Manual Speed Input - Furuno FR-2125V Operator's Manual

4. Press the [ENTER] key to conclude your selection followed by the [RADAR MENU] key
to close the FUNCTIONS 2 menu. The ship's speed readout at the top of the screen
shows own ship's speed fed from the speed log preceded by the label "LOG."
Notes on automatic speed input
1) IMO Resolution A.823(19) for ARPA recommends that a speed log to be interfaced with
an ARPA should be capable of providing through-the-water speed data (forward speed).
2) Be sure not to select LOG when a speed log is not connected. If the log signal is not
provided, the ship speed readout at the top of the screen will be blank. In the event of
a log error, you can continue plotting by entering a manual speed.
3) If a log signal interval becomes more than 30 seconds with the ship's speed five knots
or more, the radar regards the speed log is defective and LOG FAIL appears, reading
**.* KT.

5.4.2 Manual speed input

To manually enter the ship's speed with the numeric keys:
1. Press the [RADAR MENU] key and the [0] key to show the FUNCTIONS 2 menu.
2. Press the key [6] to select SHIP SPEED.
3. Press the key [6] to select (or highlight) MAN.
4. Press the [ENTER] key to conclude your selection. At this point, "MAN = 00.0KT" ap-
pears at the bottom of the FUNCTIONS 2 menu.
5. Enter the ship speed by hitting corresponding numeric keys followed by the [ENTER]
key without omitting leading zeroes, if any. As an example, if the ship speed is 8 knots,
press [0], [8], [ENTER]. For 4.5 knots, [0], [4], [5], [ENTER].
6. Press the [RADAR MENU] key to close the FUNCTIONS 2 menu. The ship speed
readout at the screen top shows own ship's speed you entered preceded by the label
"MAN."
5.4.3 Target-based speed
The use of target-based speed is recommended when:
• The speed log is not operating properly or not connected to the radar.
• The vessel has no device which can measure ship's leeward movement (Doppler so-
nar, speed log, etc.) when leeward movement can not be disregarded. If you select
target-based speed, the ARP-26 calculates own ship's speed relative to a fixed refer-
ence target. The number of targets may be 1, 2 or 3. They appear as tracked targets,
each shown in a small circle, but without a vector. When a plural of objects are se-
lected, the mean value is used for stabilization and speed. Select the number in the
PLOT MENU, referring to paragraph 5.3.2.
1. Select a small fixed island or any radar prominent point located at 0.2 to 24 nm from
own ship.
2. Place the cursor (+) on the target by operating the trackball.
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