Furuno RP-17, Operator'S Manual

Page: 13 / 48

3-2
3.3 Changing Own Ship’s Plot
Interval
The plot interval determines both how the
track will be reconstructed on the display and
the track storage time.
How the track is drawn
The “quality” of the track displayed largely
depends on the plot interval setting, smooth-
ing rate, etc.
In drawing the track, first the ship’s position
fed from the navigation aid is stored into the
radar’s memory at an interval of time or dis-
tance selected by the operator. This interval
of time or distance is called the “Plot Inter-
val” and it is selected considering the ship’s
speed, the chart scale, etc. If a shorter inter-
val is selected, a reconstructed course line
is provided with better accuracy, but total stor-
age time of the track is reduced.
Obviously there is a trade off between smooth
reconstruction of the track and plot storage
time: The shorter the interval the smoother
the reconstruction but storage time is re-
duced. The following figure compares plot
interval and track reconstruction.
Figure 3-3 Plotting interval and
how track is plotted
Plot interval by time or distance
The plot interval can be selected by “Time”
or “Distance”. “Distance” is useful when the
ship is anchored, since track is not plotted
while the vessel is stationary.
Setting plot interval
1. Press [MENU], [1], [1], [7], [7] to display
the Plot Interval menu.
2. Press the [3] key to select Time or Dist
from the Plot Mode field.
3. Press the [ENTER/SELECT] key.
4. Press the [4] key if you selected Time at
step 2; [5] key if you selected Dist.
5. Key in plotting interval with the numeric
keys.
6. Press the [ENTER/SELECT] key to reg-
ister your selection and the [MENU] key
to close the menu.
Note: You can set other ships’ plot interval
with 7. Set Other Plot Interval on the Plot In-
terval menu.
3.4 Displaying Other Ship’s
Tracks
Other ships’ tracks may be displayed when
the Auto Tracking Aid ARP-17 or ARP-10 is
interfaced with the radar. The tracks of up to
10 ships may be displayed.
The plotting interval for other ships tracks can
be set independently of that for own ship.
Also, plotting of other ships tracks may be
suspended to conserve track memory.
1. Press [MENU], [1], [1], [7], [7] to display
the Plot Interval menu.
2. Press the [7] key twice to select On from
the Other Track field.
3. Press the [8] key to select Set Other Plot
Intvl and key in plotting interval with the
numeric keys.
4. Press the [ENTER/SELECT] key followed
by the [MENU] key.