Furuno FR-1710 Operator's Manual page 35

2. Press the [2] key twice to select OFF from
the ERASE field.
3. Press the [ENTER/SELECT] key followed
by the [MENU] key.
Setting CPA/TCPA alarm ranges
When the predicted CPA of any target be-
comes smaller than a preset CPA alarm range
and its predicted TCPA less than a preset
TCPA alarm limit, the EPA releases an au-
dible alarm and displays the warning label
COLLISION appears on the screen. In addi-
tion, the EPA symbol changes to a triangle
and flashes together with its vector.
Provided that this feature is used correctly, it
will help prevent the risk of collision by alert-
ing you to threatening targets. It is important
that GAIN, A/C SEA, A/C RAIN and other
radar controls are properly adjusted.
CPA/TCPA alarm ranges must be set up prop-
erly taking into consideration the size, ton-
nage, speed, turning performance and other
characteristics of own ship.
CAUTION
CPA/TCPA Alarm
The CPA/TCPA alarm feature should never
be relied upon as the sole means for detect-
ing the risk of collision.
The navigator is not relieved of the respon-
sibillity to keep visual lookout for avoiding
collisions, whether or not the radar or other
plotting aid is in use.
To set the CPA/TCPA alarm ranges:
1. Press the [MENU] key.
2. Press the [7] key twice to display the
PLOT menu.
PLOT MENU 1
1. MARK DISP OFF ON
2. ERASE
3. VEC REF REL TRUE
4. VEC TIME 30S
15M 30M
5. CPA SET OFF
2NM
5NM
6. TCPA SET 30S
4M
7. TRACK OFF
8. AUDIO ALARM OFF
9. INTVAL* 30S
0. *
* Requires ATA Board ARP-17.
Figure 1-27 PLOT menu
3. Press the [5] key for CPA SET or [6] key
for TCPA set.
4. Press the [5] key or [6] key again to se-
lect CPA or TCPA range desired.
5. Press the [ENTER/SELECT] key to reg-
ister your selection.
6. Press the [MENU] key to close the menu.
Silencing CPA/TCPA audible alarm
Press the [AUDIO OFF] key to acknowledge
and silence the CPA/TCPA aural alarm.
The flashing of the triangle plot symbol and
vector remain on the screen until the dan-
gerous situation is gone or you intentionally
terminate tracking of the target by using the
trackball.
Lost target alarm
When the system detects a lost target, track-
ing on the target is discontinued and the tar-
get symbol becomes a flashing diamond. The
normal plotting symbol is restored to the tar-
get when the target is manually acquired. If
not reacquired the flashing diamond is auto-
matically erased. To confirm a lost target,
place the cursor on it and press the [CAN-
CEL/CLEAR] key.
1M 3M 6M
0.5NM 1NM 1.5NM
3NM 4NM
6NM
1M 2M 3M
5M 6M 12M 15M
ON
ON
1M 2M 3M 6M
1-21