Furuno FSV-24, Operator'S Manual

Page: 46 / 174

2. HORIZONTAL MODE
2-18
2.11.3 Position mode
This mode tracks a stationary position (such as a reef) using position data fed
from a navigator.
Depth
60
°
60
°
A B C D
E
Figure 2-20 How position mode target lock works
1. Select TARGET MARK at step 6 in the procedure in paragraph 2.11.1.
2. Use the trackball to select the location to track.
3. Press the [TARGET LOCK] key to inscribe the target lock mark (
) at the
location selected. The target lock mark is also inscribed on the vertical
display.
Tilt, range and vertical bearing are automatically adjusted to track the location.
Using the figure above as an example, the target lock mark is placed on location
E. Then, the equipment remembers the location of E and automatically changes
the tilt angle as the ship moves from position A through D. As long as the fish
school E is stationary its echo is kept displayed on the screen.
The position mode target lock works up to the tilt angle of 60
°
and the range
between 40 m and maximum range. If the tilt angle is exceeded, as it has in
position B and C in the above figure, for example, target position is considered
as dead in water, however position calculation continues. Once the tilt returns to
within 60
°
target lock is resumed.