B&G H2000 Pilot *DISCONTINUED* - Manual (Page 152)

HB-0844-04
6-10
reliable soundings can be made when traveling in a straight line.
Then repeat the tests when turning to port and starboard. If better
results can be obtained when turning it is possible that there is
something in front of the transducer causing aeration. This may be a
hull fitting like a water outlet in which case the transducer or the hull
fitting should be moved. If there seems little difference whether
turning or not, the position of the transducer should be reviewed. It
may be coming out of the water at high speed or in rough water. It is
impossible to give specific instructions on where to re-site the
transducer as it is so dependent on the design of boat. Generally,
better results will be obtained nearer the centre line of the boat. If
there is only a problem when heeled, consider fitting two
transducers with a changeover switch.
6.3.3 Consistently Shows Shallow Depth
Symptom: Display consistently shows a shallow depth between 0 and
about 1.5m.
Possible causes:
(a) Faulty transducer. Transducer rings for too long after the
transmit pulse is sent and the ringing is interpreted as a shallow
return by the depth sounder. On a deep keeled yacht it may be
possible to overcome this problem by increasing the minimum
depth to just less than the draft of the yacht. The minimum depth is
adjusted by changing CAL VAL1 on NOISE.
PARAMTR
→
NOISE, CALBRATE
→
CAL VAL1 (MIN DPTH M)
The default setting for minimum depth is 0.7 metres.
(b) Keel echoes. If the transducer has been installed too close to
the keel it is possible to get consistent echoes from the keel. The
transducer should be re-sited further away from the keel. If this is
impossible then increasing the minimum depth to just below the keel
can solve the problem but may result in poor performance when the
bottom is shaded by the keel. Marginal cases are sometimes
caused by side lobes from the main beam from the transducer and
may be cured by rotating the transducer in the housing.