Teleflex TFX128, Operation Manual

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13
USING THE 128 SERIES
CONTROL MENUS
Z
OOM
. Zoom is similar to Depth
Range because it controls the range
of information displayed on screen.
Zoom, however, allows selection of
ranges beneath the surface so any
area of water between the surface
and the bottom can be enlarged to
provide more detailed information. By
using the full height of the display to
show a small area of coverage, the
effective display resolution is
increased, and the unit’s ability to
separate close targets is enhanced.
There are four Zoom ranges available:
7
¹
/
₂
', 15', 30' and 60'. These ranges
are not directly user controlled but
are instead dependent on the current depth range. In shallow water,
when the 15' or 30' range is in use, the Zoom range is 7
¹
/
₂
'. If the 60' or
120' range is in use, the Zoom range is 15', if a 180'-480' depth range is
in use, the Zoom range is 30' and if the 600' range is in use, the Zoom
range is 60'.
The Zoom range is shown on the left side of the screen and full range
information is shown on the right side of the display. Zoom can either
operate automatically, in which the Zoom range is constantly adjusted to
show the bottom, or manually, in which the user controls the location of
the Zoom range.
A
UTOMATIC
Z
OOM
is especially helpful when
looking for structure or bottom detail. The
Automatic Zoom keeps the bottom in view even in quickly changing terrain,
but is most useful in flatter areas without considerable depth variation.
M
ANUAL
Z
OOM
provides detailed information of any area from the surface
to the bottom. In manual Zoom, the Zoom
range does not move as the terrain
changes.
Lower Zoom Limit
Upper Zoom Limit