Furuno 851 MARK-2 - Manual (Page 28)

2-19
2.24 Selecting Unit of
Measurement for Range
The unit of measurement for the VRM and
cursor can be nautical miles, kilometers, or
statute miles. You may select unit desired
as follows.
1. Press the [MENU] key.
2. Press the omnipad at 6 o’clock to
select Mode & Function and press the
[ENT] key.
3. Press the omnipad at 6 o’clock to
select VRM Unit.
4. Press the omnipad at 3 o’clock/9
o’clock to select NM, KM, or SM as
desired.
5. Press [ENT] followed by [MENU] key.
2.25 Selecting Bearing
Reference
Bearing can be displayed relative to ship’s
heading (relative bearing) or relative to true
north (true bearing) as follows. (True
bearing requires heading sensor input.)
1. Press the [MENU] key.
2. Press the omnipad at 6 o’clock to
select Mode & Function and press the
[ENT] key.
3. Press the omnipad at 6 o’clock to
select EBL Ref.
4. Press the omnipad at 3 o’clock/9
o’clock to select REL(ATIVE) or TRUE
as appropriate.
5. Press the [ENT] key followed by the
[MENU] key.
2.26 Watchman
How watchman works
The watchman function periodically
transmits the radar for about one minute to
check for targets in a guard zone. If it finds
change in the zone from the previous
transmission it sounds the aural alarm,
cancels the watchman function, and
transmits the radar continuously. This
feature is useful when you do not need the
radar’s function continuously but want to be
alerted to radar targets in a specific area.
Tx St-by St-by Tx
1 min 1 min 5, 10 or
20 min 5, 10 or
20 min
Watchman
starts.
Figure 2-22 How watchman works
Turning on watchman
1. Create a guard zone (usually 360
degrees) with the guard alarm function.
2. Press the [MENU] key.
3. Press the omnipad at 6 o’clock to
select Mode & Function and press the
[ENT] key.
4. Press the omnipad at 6 o’clock to
select Watchman.
5. Press the omnipad at 3 o’clock/9
o’clock to select watchman rest interval
(amount of time until next rotation of
antenna); 5 minutes, 10 minutes or 20
minutes as desired.
6. Press the [ENT] key followed by the
[MENU] key. Then, WATCHMAN
appears, and the radar transmits for
one minute and then goes into stand-
by.