Raymarine DSM250 Owner's Handbook Manual page 10

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Chapter 6: Sonar Mode Operation ........................................... 6-1
Chapter 7: Maintenance and Problem Solving ...................... 7-1
Appendix:
Using Zoom .................................................................5-24
6.1 Introduction ...........................................................6-1
6.2 Interpreting and Adjusting the Sounder Image .....6-1
Fish Indications ..............................................................6-2
Bottom Indications .........................................................6-3
Using White Line ...........................................................6-5
Adjusting Display Gain (Sensitivity) .............................6-5
Using Alarms .................................................................6-8
6.3 Using VRM to Determine Depth & Distance from
Vessel ...................................................................6-10
6.4 Waypoints ............................................................6-12
Placing a Waypoint ......................................................6-13
6.5 MOB ....................................................................6-14
7.1 Maintenance ..........................................................7-1
Routine Checks ..............................................................7-1
Cleaning Instructions .....................................................7-1
EMC Servicing and Safety Guidelines ..........................7-2
7.2 Resetting the System .............................................7-3
7.3 Problem Solving ....................................................7-4
Status LED .....................................................................7-6
How to Contact Raymarine ............................................7-7
Worldwide Support ......................................................7-10
Specifications ........................................................A-1
DSM250 Digital Sounder Module