Suppressing Second-Trace Echoes; Watchman - Furuno FR-8062 Operator's Manual

1.31

Suppressing Second-trace Echoes

In certain situations, echoes from very distance targets may appear as false echoes (second-trace
echoes) on the screen. This occurs when the return echo is received one transmission cycle later,
or after a next radar pulse has been transmitted.
1. Press the MENU key to show the menu.
2. Choose Echo and then press the ENTER key.
3. Choose 2nd Echo Rejector and then press the ENTER key.
4. Choose On or Off as appropriate and then press the ENTER key.
5. Press the MENU key to close the menu.
1.32

Watchman

The watch alarm sounds the audible alarm at the chosen time interval to help you keep regular
watch of the radar picture for safety or other purposes.
The watchman time appears at the lower-left corner of the screen with a watch alarm timer which
counts down from value set (for example, "10:00").
When a preset time interval has elapsed, the audible watch alarm is released, the screen label
WATCH turns red and the watch alarm timer freezes at "0:00." To silence the alarm, press the
CANCEL/HL OFF key The label WATCH turns to normal color and the watch alarm timer is reset
to the initial value and starts the count-down sequence again.
If you press the CANCEL key before the selected time interval is reached, the watch alarm timer
is reset to the initial value and starts the count-down sequence again.
To set watch time interval, do the following:
1. Press the MENU key to show the menu.
2. Choose DIsplay and then press the ENTER key.
3. Choose Watchman Time and then press the ENTER key.
4. Choose Off or appropriate time and then press the ENTER key.
5. Press the MENU key to close the menu.
Tx repetition
Actual range
How 2nd trace echoes are produced
1. OPERATIONAL OVERVIEW
Second-trace
echo
False echo
range
1-35