CVS-833/833C
Chapter 5
Basic Operation
Zoomed depth range is displayed by an orange color bar.
Normal image
5.5.4.3 Displaying Bottom Zoom (BZ) image
This feature allows viewing at a zoomed depth range with the sea bottom fixed at the bottom of the
screen. Using the bottom line as reference, this function zooms up the areas above the bottom. This
function indicates height from the bottom in solid scale lines while the bottom depth is indicated by the
original depth scale, so you can closely observe schools of fish near the bottom. To use this function:
1.
Open Sub Menu 1
and select “Zoom range” (Para. 6.4.1) to set up a zooming range.
2. Open Sub Menu 7 and select “BTM Zoom”. Refer to Para 6.10.1 “BTM Zoom”. The color of the
letters BZ will turns to yellow.
3.
Turn the MODE selection switch to NORM/BTM of either Low or High frequency.
Depth markers
Zoomed depth range
Figure 5.9 Bottom Zoom (BZ) image display
Figure 5.8 Bottom Discrimination (B.D.) image display
The letters BZ turns to yellow
BTM Zoom
BTM
BD
BZ
Horizontal split screen
Vertical split screen
Bottom Discrimination image
Discrimination
Normal range
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