Vexilar FL-10 - Manual (Page 11)

11
HOW TO FIND BOTTOM
To read how deep it is, start at the zero mark (at the 12
o’clock position) and move clockwise. The bottom will be the
largest mark other than the zero. The leading edge, the one
closest to zero, will be where you read the depth. The width
and color makeup of the bottom mark tells you what kind of
bottom it is.
The three-color display on the FL-10 will give you a lot
more information than just depth. A color represents the
strength of a signal. A red color indicates a strong signal, an
orange color indicated a medium strength signal, and green
represents a weak signal. The colors will combine to give you
information about objects, such as bottom echoes, structure,
fish, and plankton. The way in which these colors combine,
and the width of the marks, tells you what is what.
Note - Depth will not “wrap” beyond zero. Changing ranges is
required if the depth drops below the current range setting.
HARD BOTTOM
Under these conditions the bottom will be mostly red,
although you will always see some orange and green at the
trailing edge, as in figure J. A sharp red leading edge tells you
that the bottom is very clean. If you were to move from a hard
bottom to a softer bottom you would see the bottom mark
get wider and a change in color to more orange and green.
Try not to change the gain setting as you move around as this
will affect the color and width of the mark.