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Chapter 1: Overview
1.1 Introduction
This handbook describes how to install the DSM25 Digital Sounder Module and
operate it using the A65 display unit. The DSM25 emits and receives sonar signals
from a transducer mounted in the water, then interprets and transmits the data to
the A65 installed on the console.
The DSM25 employs a very high transmission repetition or “ping” rate which,
along with the digital adaptive high sample rate receiver, ensures that fish and
bottom structure are presented in superb detail and optimal color allocation. The
DSM25 digital bandwidth adaptation adjusts the receiver band width
dynamically from very wide to very narrow, as required by the actual water
conditions. This provides superior fish and bottom detection in all surroundings.
The DSM25 module is waterproof to IPX7 and can be installed either above or
below deck.
The unit includes connections to:
• power and data via the A65
• the transducer
The DSM25 requires a transducer, mounted either thru-hull, in-hull, on the
transom or on a trolling motor. Transducers can measure water depth, and if so
equipped, temperature, distance traveled, and/or speed. It is important to
position your transducer correctly.
D7737-1
81254.book Page 11 Monday, March 6, 2006 2:29 PM
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