Raymarine DSM300 - Manual (Page 63)

Chapter 5: Sonar Mode Operation 63
Chapter 5: Sonar Mode Operation
5.1 Introduction
Basic operation, including a description of the different display options, was given
in Chapter 4. This chapter explains how to use the display unit to show sonar
data. It describes how to fine-tune the image and use the controls to get
additional information.
Note: This chapter describes using the DSM300 Digital Sounder Module with a Rayma-
rine hsb 2 PLUS (Pathfinder) Series display. Instructions for operating the DSM300 with a C
Series or E Series display are available in the handbooks for those products.
This chapter covers the following topics:
• Interpreting and Adjusting the Sounder Image, including fish and bottom
indications, using the white line feature and adjusting gain (sensitivity)
• Viewing Data Windows
• Setting up and Using Alarms for fish, shallow water and deep water
• Using a VRM to Determine Depth and Distance from Boat to a particular spot
• Placing Waypoints
• Using the Man Overboard (MOB) function
Note: The settings described in this chapter are retained when the unit is powered off.
However, there is a one-minute delay from the time you change the setting to when the
DSM300 places it in memory. If you power down the sounder less than one minute after
making a change, the setting is lost.
Many of the parameters on the DSM300 have both manual and automatic modes.
The automatic setting takes advantage the hardware’s advanced digital
technology. As a result, the sounder typically performs better in automatic mode
than in manual. For better performance, Raymarine recommends that you select
AUTO mode wherever it is an option.