Furuno FR-2805 Series - Manual (Page 24)

1-9
1.8 Initializing the Gyro
Readout
Provided that your radar is interfaced with
a gyrocompass, ship's heading is dis-
played at the top of the screen. Upon turn-
ing on the radar, align the on-screen
GYRO readout with the gyrocompass
reading by the procedure shown below.
Once you have set the initial heading cor-
rectly, resetting is not usually required.
However, if the GYRO readout goes
wrong for some reason, repeat the pro-
cedure to correct it.
1. Open the tuning compartment and
press the HOLD button. The Gyro LED
lights.
Gyro readout
adjustment
switches
ORIGIN MARK VECTOR TRUE/ REL VECTOR TIME
Gyro
LED
DEGAUSS switch
2. Press the UP or DOWN button to du-
plicate the gyrocompass reading at the
on-screen GYRO readout. Each press
of these buttons changes the readout
by 0.1-degree steps. To change the
readout quickly, hold the UP or DOWN
button for over two seconds.
3. Press the HOLD switch when the on-
screen GYRO readout has matched
the gyrocompass reading. The Gyro
LED goes out.
Note: The HOLD button is used to disen-
gage the built-in gyro interface from the
gyrocompass input in the event that you
have difficulty in fine-adjusting the GYRO
readout due to ship's yawing, for example.
When initializing the GYRO readout at a
berth (where the gyrocompass reading is
usually stable), you may omit steps 1 and
3 above.
1.9 Presentation Modes
This radar has the following presentation
modes:
Relative Motion (RM)
Head-up: Unstabilised
Head-up TB:Head-up with compass-
stabilized bearing scale
(True Bearing)
Course-up: Compass-stabilized rela-
tive to ship's intended
course
North-up: Compass-stabilized with
reference to north
True Motion (TM)
North-up: Ground or sea stabilized
with compass and speed in-
puts
Selecting presentation mode
Press the MODE key on the mode panel.
Each time the MODE key is pressed, the
presentation mode and mode indication
at the upper-left corner of the screen
change cyclically.
HL
OFF
ECHO
TRAILS
MODE
ORIGIN
MARK
VECTOR
TRUE/
REL
VECTOR
TIME
GUARD
ALARM
EBL
OFFSET
OFF
CENTER
When the gyro signal is lost, the presentation
mode automatically becomes head-up and
the GYRO readout at the screen top shows
asterisks (***.*). The message SET HEADING
appears at the lower-left corner of the screen.
This warning stays on when the gyro signal is
restored, to warn the operator that the readout
may be unreliable. Press the MODE key to
select another presentation mode (the asterisks
are erased at this point). Then, align the GYRO
readout with the gyrocompass reading and press
the CANCEL key to erase the message SET
HEADING.
Loss of Gyro Signal