Si-tex NAVSTAR 10, Operation Manual

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distance. The sea bottom contour is displayed and additional contour lines are added at intervals
above the sea bottom to aid in determining distances of echoes near the bottom. Use the Sounder
Menu to set the magnified Bottom Range from 2.5 to 20m (10 to 60ft.). Default setting is 10m (40ft.). If
the depth Range is set manually, the setting must place the sea bottom echo in the lower portion of the
screen for Bottom Zoom to be effective.
6.3. Bottom Lock
Bottom Lock divides the Sonar main screen image for the selected Sonar into two sections. The left
hand section displays a Normal Mode image. The right hand section of the screen displays the Sonar
image relative to the sea bottom. The sea bottom appears as a straight line with the Sonar image
magnified for a short distance toward the surface. A scale
appears on the right for estimating distances of echoes near the bottom. Use the Sonar Manu to set
the magnified Bottom range from 2.5 to 20m (10 to 60ft.). Default setting is 10m (40ft.). If the depth
Range is set manually, the setting must place the sea bottom echo in the
lower portion of the screen for Bottom Lock to be effective.
Sonar modes are selectable for single frequency or dual and some functions, for example bottom