How To Use This Handbook - Raymarine DSM25 Owner's Handbook Manual

Chapter 1: Overview
Although weaker than the fish or bottom echoes, your fishfinder picture may be
impaired by echoes received from floating or submerged debris, air bubbles or
from your boat's movements. This is known as background noise or clutter and is
controlled by the gain modes (gain, color gain and TVG). Raymarine recommends
that you enable your system to automatically control the ideal sensitivity level
based on depth and water conditions. You can however adjust these settings
manually if you prefer.

1.4 How to Use this Handbook

This handbook describes how to install and operate a DSM25 with your A65
display unit.
Chapter 2 provides planning considerations and detailed instructions for
installing the DSM25 and connecting the sounder module to the display unit.
Chapter 3 shows how to operate the A65 display to view sonar echo data and
details operating the A65's controls in Fishfinder mode.
Chapter 4 provides instructions for setting up your DSM25 to suit your
preferences.
Chapter 5 provides information on user maintenance and what to do if you
experience problems.
The Appendix lists abbreviations used in this handbook.
The following figure displays the DSM25 as part of the A65 system:
15
Target
Depth ID
Target