Lowrance lms-522c igps 操作指南

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页码 252
70 
 
Sonar Page showing FasTrack. 
Fish I.D.
 (Fish Symbols & Depths) 
The Fish I.D. feature identifies targets that meet certain conditions as 
fish. The microcomputer analyzes all echoes and eliminates surface 
clutter, thermoclines, and other signals that are undesirable. In most 
instances, remaining targets are fish. The Fish I.D. feature displays 
fish symbols on the screen in place of the actual fish echoes. 
There are several fish symbol sizes. These are used to designate the 
relative size between targets. In other words, Fish I.D. displays a small 
fish symbol when it thinks a target is a small fish, a medium fish sym-
bol on a larger target and so on. 
The sonar's microcomputer is sophisticated, but it can be fooled. It can't 
distinguish between fish and other suspended objects such as trotlines, 
turtles, submerged floats, air bubbles, etc. Individual tree limbs ex-
tending outwards from a group of limbs is the hardest object for the 
Fish I.D. feature to distinguish from fish. 
You may see fish symbols on the screen when actually, there are no 
fish. The reverse is also true. The illustrations on the next page show 
how Fish I.D. can actually miss fish that are present. 
Does that mean Fish I.D. is broken? No — the feature is simply inter-
preting sonar returns in a specific way to help take some of the work 
out of reading the screen. Remember: Fish I.D. is one of the many tools 
we provide so you can analyze your sonar returns for maximum fish 
finding information. This and other features can help you successfully 
"see" beneath the boat under varied water and fishing conditions. So, 
practice with the unit in both the Fish I.D. mode and without to become 
more familiar with the feature. The default for Fish I.D. is off. 
Surface clutter 
Structure 
Bottom signal 
Fish arches 
In FasTrack, fish 
arches show as 
horizontal bars. 
FasTrack
bar graph