How To Set Own Ship's Speed; Automatic Speed Input (Log Or Gps Navigator) - Furuno FAR-1513 Operator's Manual

1. OPERATIONAL OVERVIEW
1.12

How to Set Own Ship's Speed

The TT and azimuth stabilized presentation modes require own ship speed input and
compass signal. The speed can be entered from a log (STW, SOG) or GPS (SOG) or
manually on the menu.
Note: Where the own ship speed exceeds 99.9kn, the displayed speed is "99.9kn".
1.12.1

Automatic speed input (log or GPS navigator)

1. Select the [SPD] box at the top right corner of the
screen, then press the right button. The [SPEED]
box menu appears.
2. Select [SHIP SPEED], then push the ADJUST knob.
3. Select the appropriate source for automatic speed in-
put, then push the ADJUST knob.
Selection
[LOG (BT)]*
[LOG (WT)]
[GPS]
[MANUAL]
[REF]
*: Set and drift may be required to display [LOG (BT)] correctly in deep waters. To
change set and drift do the following:
1) From the [SPEED MENU], select [SET DRIFT], then push the ADJUST knob.
2) Select [ON], then push the ADJUST knob.
3) Select the set angle, then push the ADJUST knob.
4) Select the drift speed, then push the ADJUST knob.
4. Close the menu.
Notes on speed input
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
experiencing set, drift or leeway. Similarly, a sea stabilized target plot may be inaccu-
rate 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 "LOG(BT)" or "LOG(WT)" (in yellow-or-
ange) 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.
1-12
Explanation
Log, speed over ground (SOG)
Log, Speed Thru Water (STW)
Speed input by GPS navigator
Manually input speed
Echo-referenced speed input
[SPEED MENU]
1 SHIP SPEED
LOG(BT) / LOG(WT) /
GPS / MANUAL REF
2 MANUAL SPEED
0.0KN
Stabilization Mode
Ground stabilization
Sea stabilization
Ground stabilization
Sea stabilization
Ground stabilization