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1. RADAR OPERATION
1-21
[SPEED MENU]
1 SHIP SPEED
LOG(BT)/LOG(WT)/
GPS/MANUAL/REF
2 MANUAL SPEED
0.0kt
3 SET DRIFT
OFF/ON
1.13 Entering Own Ship's Speed
The ARP and azimuth stabilized presentation modes require own ship speed
input and compass signal. The speed can be entered from a log (STW) or GPS
(SOG) or manually on the menu. Note that FURUNO GPS Navigator GP-90
provides COG and SOG.
1.13.1 Automatic speed input by log or GPS navigator
1. Roll the trackball to place the arrow in the SPD box at the top right corner of
the screen.
2. Push the right button to display the SPEED menu.
SPEED menu
3. Roll the wheel to choose 1 SHIP SPEED and then push the wheel or the left
button.
4. Roll the wheel to choose the appropriate source for automatic speed input
and then push the wheel or the left button.
LOG (BT): Log, speed over ground (SOG). Note that a log cannot produce
BT (Bottom Tracking) speed in deep waters without set and drift
entry.
LOG (WT): Log, speed thru water (STW)
GPS: Speed input by GPS navigator
5. Push the right button to close the menu.
Notes on speed input
• 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 (forward speed).
• Be sure not to choose 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.
• Warning label SPD **.* and LOG appear if no log signal is present for 30 s
while the ship’s speed has been more than 5 kt.
• With the serial speed inputs and SOG selection, if the type of data is changed
from SOG to STW the label SOG appears in red (at the upper right corner of
the display).
• When the AIS feature is active, MANUAL and REF are shown in gray to
indicate they are not available for selection.