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2
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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:
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 5 kt or more,
the radar regards the speed log is defective and LOG FAIL appears, reading xx.x KT. If no
speed input is present for 3 minutes at below 0.1 kt, the radar regards the log is defective.
Manual speed input
To manually enter the ship's speed with the numeric keys:
1. Press the RADAR MENU key and [0] key to show the FUNCTIONS 2 menu.
2. Press the key [6] to select menu item SHIP'S SPEED.
3. Press the key [6] to select (or highlight) MAN option.
4. Press the ENTER key to conclude your selection. At this point, "MAN = xx.x KT" appears
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 "MENU."
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 sonar,
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
reference 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 selected, the mean
value is used for stabilization and speed. Select the number in [PLOT MENU], see section
2.3.
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.