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Scanning Directions.
Vertical Scan mode
shown above and
Horizontal Scan
mode below
VERT: Vertical Scan Display
The VERT display shows the image created by the
vertical scanning transducer elements. This array
scans through a maximum of 90 degrees in a sector
starting horizontally in the direction that the boat is
heading and ending vertically beneath the transducer
(see figure at left).
The vertical scan is shown with the transducer at the
upper left corner of the display window with the se-
lected range extending to the lower right corner of
the window. As a result, the scale bars will usually
indicate maximum distances that are less than the
selected range.
HORZ180: Horizontal Scan
Display
The HORZ180 display shows the image created by
the horizontal scanning transducer elements. This
array scans forward up to 180 degrees from port to
starboard in a sector that is tilted downward from
horizontal by about 10 degrees (see figure at left,
center).
The horizontal scan is shown with the transducer at
the bottom of the display window and the selected
range extending to the top of the window, regardless
of the window's width. Thus, data will be clipped
on the sides of a tall, narrow display (see figure at
bottom left).
DOWN: Downlooker Display
The downlooker display shows the region directly
beneath the boat over time. The right edge of the
display always shows the most recent ping.
Since PC/180 does not know boat speed, the down-
looker display cannot be used to determine horizontal
distances. Thus, there is no horizontal scale bar in
the downlooker display.
PC/180 can extract DOWN data from either the hori-
zontal array or the vertical array. This is because the
horizontal array includes a separate down-looking
transducer for the purpose of collecting depth infor-
mation.
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