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1. OPERATIONAL OVERVIEW
1-17
1.9 Find Depth and Position of a Fish Echo
You may measure the depth to a fish school or bottom with the horizontal line marker, called
the horizontal VRM (Variable Range Marker) marker. Further, you may measure elapsed
time with the vertical VRM. For example, you can measure how many minutes before the
current time a fish echo appeared.
TS
20
40
60
80
0
40
00:00:28
34 42.616' N
135 19.740' E
Horizontal VRM
Depth to
horizontal VRM
Vertical
VRM
Elapsed time and
postion* to vertical VRM
* Position shown in red when position data is lost.
Measuring depth, elapsed time and position with the VRMs
Measuring depth
1. Roll the trackball to place the pointer on the horizontal VRM. The shape of the pointer
changes to (
).
2. Hold down the left button while rolling the trackball upward or downward to place the
horizontal VRM on the object that you wish to measure the depth.
3. Read the depth indication (on the horizontal VRM).
Measuring elapsed time
1. Roll the trackball to place the pointer on the vertical VRM.
2. Hold down the left button while rolling the trackball leftward or rightward to place the
VRM on the object that you wish to find position.
3. Read the elapsed time and position (on the vertical VRM).
Note 1: The color of the VRMs can be changed. See paragraph 3.5
Note 2: You may change the location of the depth indication on the horizontal VRM. For
further details see paragraph 3.2.