B&G H2000 Pilot *DISCONTINUED* - Manual (Page 56)

h2000 User Manual
56 HB-0845-06
2.9.17 Depth
Menu heading: DEPTH
Function text: DEPTH
Update rate: 1Hz
Units: Metres, feet and fathoms
Notes
1. Shallow alarm available, range 0-99.9m
2. Deep alarm available.
3. Analogue indicator available, 0-200 m or 0-100
ft/fm
Depth calculation is one of the most important functions
required for essential navigational and safety. On a network,
rather than as a separate unit, Depth can be accessed from
any display on the boat. A datum adjustment allows the base
point to be moved to give either depth under the keel from
the waterline or depth from the transducer.
Depth sounder performance is dependent on transducer type
and installation, boat speed, electrical noise, sea state, sea
bed conditions, air and plankton in the water. There will
always be times when a reliable measurement of depth is
not possible; in such cases, for instance, following in the
wake of another boat, the display shows four floating bars to
indicate a signal problem.
The accuracy of the measurement is dependent on the
velocity of sound and the amount the sound penetrates the
sea bottom. Changes in the velocity of sound are not
normally significant, however, errors up to one foot can
result from sound penetration into very soft mud.