1. OPERATIONAL OVERVIEW
1-13
Notes on speed input
1.12.2 Manual speed input
If the speed log is not working, enter speed manually as below. In this case the speed
data type is shown as "MANUAL" and is speed thru water (STW). Manual speed input
is not available on the IMO radar when the AIS feature is active.
1. Select the [SPD] box at the top right corner of the screen, then press the right but-
ton to display the [SPEED] menu.
2. Select [SHIP SPEED], then push the ADJUST knob.
3. Select [MANUAL], then push the ADJUST knob.
4. Select [MANUAL SPEED], then push the ADJUST knob.
5. Rotate the ADJUST knob to set speed.
6. Push the ADJUST knob to confirm the new setting.
7. Close the menu.
It should be noted that in determining a target's aspect by radar, the calculation of its
true track is dependent on the choice and accuracy of the own ship's course and speed
input. A ground-stabilized target plot may accurately calculate the ground track of the
target, but the target's heading may be significantly different from its track when experi-
encing set, drift or leeway. Similarly, a sea stabilized target plot may be inaccurate when
own ship and the target, are experiencing different rates of set, drift or lee-way.
• IMO Resolution A.823(19) for TT recommends that a speed log to be interfaced with
a TT should be capable of providing through-the-water speed (forward speed).
• Be sure not to select a [LOG] option 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, enter speed manually.
• The [SPD] is shown as "*.* kn" and the label "NO LOG(BT) SIGNAL" or "NO
LOG(WT) SIGNAL" (in yellow-orange) appears and the alert buzzer sounds if no log
signal is present for 30 s.
• When the speed input in use is interrupted or lost, the system automatically changes
to another speed input (stabilization reference) and outputs the "SPD SOURCE
CHG" alert.
• On the IMO type with AIS in use, [MANUAL] and [REF] are shown in gray to indicate
they are not available for selection.
• A single-axis water log cannot measure speed when the wind is coming from the lee-
way direction.
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