GENERAL OPERATION
(All tests must be carried out with the transducer lead plug inserted into the back of the set and with the vessel afloat. Meaningful
tests cannot be carried out with the transducer operating in air or in a water container.)
With the set turned ‘on’, the Seafarer 700 offers six forms of depth information or Depth Guard facilities. These are:
1. Dual Display
With the function switch in the ‘ON’ position and the range switch in the ‘60 feet’ (or 0—20 metres in the metric version of the
Seafarer 700) position, the set will present a water depth by yellow LED on the dial and by LCD in the digital display panel. The
gain control should be adjusted so that multiple depth echoes on the dial are eliminated and one steady reading is obtained. It
should be noted that the LCD display reads in feet only, even if the range switch is turned to the 60 metres or 100 fathoms
positions. (On the metric version of the Seafarer 700. the dial and LCD display depth readings are in metres at all times.) The
digital display presents a depth from 2.6 feet to 9.9 feet and then automatically changes to 10 feet, up to a maximum of 99 feet.
(0.8 metres to 99 metres on the metric version.) Below 2.6 feet (0.8 metres) with the gain control turned too high. a reading of
double the true depth may be seen. Thus. in conditions of very shallow water it is advisable to take the depth reading from the
dial display, ignoring the second echo. As the depth of water beneath the transducer increases, the gain control should be
gradually turned up so that a steady reading is obtained on both the dial and the digital display.
2. Shallow Water Alarm “Al”
By moving the function switch to “Al”, the shallow water alarm setting may be activated. Upon moving the shallow water alarm
control from Minimum, a red LED will be indicated on the dial. Adjustment of this LED to a position on the dial to the depth at
which it is desired that the alarm buzzer within the set will operate, is confirmed by the LCD in the display panel. In practice,
when the depth of water drops to the setting selected, the alarm will sound. The minimum depth at which the alarm will operate
is 2 feet 6 inches (0.8 metres).
3. Deep Water Alarm “A2”
By moving the function switch to “A2”, the deep water alarm setting may be activated. Upon moving the deep water alarm
control from minimum, a red LED will be indicated on the dial and its position confirmed on the LCD display panel. The deep
water alarm setting maximum is 95 feet (29 metres on the metric version). (Whilst this adjustment is carried out, the previous
shallow water alarm setting is retained in electronic memory.)
4. Shallow and Deep Water Alarms
After selecting the desired shallow and deep water alarm settings as described above, the function switch may be moved back to
the “Dual Display” position. The Seafarer 700 will now display the depth of water by yellow LED on the dial, and also by LCD
in the display panel. The previously selected positions of the shallow and deep water alarms will be confirmed by red LEDs on
the dial.
5. Depth Guard (Active)
With the position of both the shallow and deep water alarms having been set as above, the function control switch may be moved
to the “Depth Guard” position, with the alarm settings retained in the electronic memory. When this has been done, the rotor on
the dial will cease to rotate but the yellow and red LEDs mounted on the rotor will flash intermittently, indicating that both depth,
and alarm settings, are being monitored. The depth of water will be indicated on the LCD display. In this mode, the Seafarer uses
approximately one eighth of its normal current consumption.
6. Depth Guard (Inactive)
With the function switch in the “Depth Guard” position and the shallow and deep water alarm controls turned to minimum, both
alarm systems are de-activated. Since the rotor on the dial ceases to rotate, the depth of water reading has to be taken from the
LCD display. Because of the saving in current consumption in this mode, it is ideal for normal cruising purposes although it must
be remembered that the LCD cannot present a depth greater than 99 feet (or 99 metres on the metric version).
DIGITAL REPEAT METER (Optional Extra)
A digital repeat meter is available as an optional extra. This instrument is suitable for use with Seafarer 5 or Seafarer 700 echo
sounders. The meters are single range and can be supplied calibrated to read in feet or metres. The “metric” model reads from 0.8
metres to 119.9 metres and the “feet” model from 2.7 feet to 599.9 feet. WITH THE SEAFARER 700 SET IN THE ‘DEPTH
GUARD’ MODE, THE REPEAT METER WILL CONTINUE TO INDICATE TRUE DEPTH, WELL BEYOND THE
MAXIMUM RANGE OF THE ECHO SOUNDER. UNDER IDEAL CONDITIONS, THE MAXIMUM RANGE OF THE
REPEAT METER WOULD BE 999.9 FEET.
The calibration of the repeat meter is independent of the echo sounder and it will continue to read in its factory set units,
whichever echo sounder model (foot/fathom or metric) it is used with. Depth is indicated on a four digit liquid crystal display
which is fitted with red, LED edge lighting for night use.
