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2.4 Entering Own Ship’s Speed
The ATA requires own ship’s speed and heading data. Of these, the speed data can be entered
automatically from a speed log, navaid or manually through the menu.
Note: It is customary to use a speed relative to water for collision avoidance and a speed over the
ground for navigation purpose.
2.4.1 Automatic speed input
1. Press [MENU], [0], [0] to display the OTHERS menu.
OTHERS
1. HDG SET
2. SPD MODE MAN LOG
LOG (S-BT)
LOG (S-WT)
3. MAN SPD
4. SET & DRIFT
5. DISPLAY
6. MARK/LINE
7. TUNE
8. NAV DATA
9. EBL/+/PI
0. ↓
2. Press the [2] key to select LOG or NAV (R-type only) from the SPD MODE field.
3. Press the [ENTER/SELECT] key.
4. Press the [MENU] key to close the menu.
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. This applies to the ATA as
well.
2) Be sure not to select LOG when a speed log is not connected. If the log signal is not provided,
the ship’s speed readout at the screen top will be blank.
3) SPEED xx.x and SIGNAL MISSING “ LOG” appears if no log signal is present for 30 seconds
while the ship speed has been more than 5.0 kt.