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DSM25Digital Sounder ModuleOwner’s HandbookDocument number: 81254-2Date: March 200681254.book Page 1 Monday, March 6, 2006 2:29 PM

10 DSM25 Owner’s HandbookConventionsThroughout this handbook, the dedicated (labelled) keys are shown in bold capitals (for example, ENTER). The soft

11Chapter 1: Overview1.1 IntroductionThis handbook describes how to install the DSM25 Digital Sounder Module and operate it using the A65 display unit

12 DSM25 Owner’s Handbook1.2 What the Sounder DisplaysWhen you first view the Fishfinder application on the A65, an image representing the echoes rece

Chapter 1: Overview 131.3 How the Fishfinder WorksThe Fishfinder application uses the DSM25 to process sonar signals from a suitable transducer and pr

14 DSM25 Owner’s HandbookThe dark layers indicate a good echo; the lighter areas weaker echoes. This could mean that the upper layer is soft and there

Chapter 1: Overview 15 Although weaker than the fish or bottom echoes, your fishfinder picture may be impaired by echoes received from floa

16 DSM25 Owner’s Handbook DSM25TransducerRS12 GPSA65 DisplayD7746-1Power Supply81254.book Page 16 Monday, March 6, 2006 2:29 PM

17Chapter 2: DSM25 Installation2.1 IntroductionThis chapter provides details for mounting the DSM25 and connecting to the A65 display. For the system

18 DSM25 Owner’s Handbook2.3 Optional EquipmentIf a longer connection is required from the DSM to the display, you can purchase one of the following A

Chapter 2: DSM25 Installation 19• Status LED: Mount the unit where you can view the status LED on the front fascia. See page 53 for details.

Trademarks and registered trademarksRaymarine is a registered trademark of Raymarine plc.All other product names are trademarks or registered trademar

20 DSM25 Owner’s Handbook 3. Drill a 9/64" (3mm) pilot hole at each of the marked locations. Note: For fiberglass with a g

Chapter 2: DSM25 Installation 215. Mount the module to the surface, slipping the screw heads through the two key holes.6. Press the module downward so

22 DSM25 Owner’s Handbook• Secure cables in place using tie-wraps or lacing twine. Coil any extra cable and tie it out of the way.CAUTION: Do Not Cut

23Chapter 3: Using the Sounder Module3.1 IntroductionThe standard fishfinder image is an historical, scrolling bottom graph at an automatically select

24 DSM25 Owner’s Handbook3.2 Selecting the Display PageBefore viewing fishfinder functions, you must select the fishfinder page on the A65 display. Th

Chapter 3: Using the Sounder Module 25• Chart/Fishfinder PageSplit windows displaying sounder and chart information• Fishfinder/Navigation Data PageSp

26 DSM25 Owner’s Handbook• Fishfinder/Temperature Graph PageSplit windows displaying sounder and a graph plotting water temperature readings from the

Chapter 3: Using the Sounder Module 27Using the Course Deviation Indicator (CDI)With your display receiving accurate heading and position information,

28 DSM25 Owner’s Handbook3.3 Adjusting the DisplayThis section describes the controls you can use to change how sounder data is displayed on the A65 i

Chapter 3: Using the Sounder Module 29Soft Key SelectionsThe soft keys presented on the main fishfinder screen provide selections for the most commonl

3ContentsImportant Information ...7Intended Use ...

30 DSM25 Owner’s HandbookAuto GainThe GAIN, or sensitivity, of the display adjusts background noise by varying the echo strength for display. The valu

Chapter 3: Using the Sounder Module 313. Use the rotary knob to adjust the value in the slider. This value takes immedi-ate effect:• GAIN MODE. This s

32 DSM25 Owner’s HandbookTo change the frequency to a manual setting:1. Press FISHFINDER SETTINGS. A new set of soft keys appear.2. Press FREQUENCY un

Chapter 3: Using the Sounder Module 333.5 Zoom .The DSM25 automatically keeps the bottom image in the lower half of the window. When you ne

34 DSM25 Owner’s HandbookThese factors are proportioned to the range. Therefore, as the range increases, the area shown in the zoom window also increa

Chapter 3: Using the Sounder Module 35 Note: If the A-Scope or Zoom image was displayed, selecting Bottom Lock automatically switches OFF

36 DSM25 Owner’s Handbook3.7 A-Scope Use the A-Scope screen to show raw sonar data directly from the transducer beam. This gives you a “rea

Chapter 3: Using the Sounder Module 373.8 PresentationYou can further adjust the fishfinder image using features accessed via the PRESENTATION soft ke

38 DSM25 Owner’s HandbookWhite Line and Bottom Fill togetherWhen both White Line and Bottom Fill are applied, the bottom is defined by a white line an

Chapter 3: Using the Sounder Module 39SCROLL PAUSE/RESUME Select SCROLL PAUSE to pause the display to see a ‘snapshot’ of the image. This allows you

4 DSM25 Owner’s HandbookOperating Frequency ...31Power Settings ...

40 DSM25 Owner’s Handbook3.10 Using WaypointsMarking a position enables you to return to that spot at a later date. A position is marked on the screen

41Chapter 4: Fishfinder SetupFishfinder Setup functions can be accessed using the controls that are displayed when you press the MENU key on the A65 d

42 DSM25 Owner’s Handbook 4. Press the trackpad or rotate the knob to highlight the desired operation. 5. Press the trackpad (ri

Chapter 4: Fishfinder Setup 434.1 DSM SetupThis section details parameters listed in the Fishfinder Setup menu.Depth Digit SizeThis setting controls t

44 DSM25 Owner’s HandbookDepth OffsetThe depth offset is added to the measured depth value before it is displayed. You can specify the depth as a posi

Chapter 4: Fishfinder Setup 45Interference Rejection (Int Rej)Two or more sonar-equipped vessels operating within range of each other can interfere wi

46 DSM25 Owner’s Handbook4.2 Fishfinder AlarmsIn addition to the A65 system alarms, the following alarms can be set when you are connected to a DSM or

Chapter 4: Fishfinder Setup 47Fish AlarmIf this alarm is ON, the unit sounds a beeper whenever it finds a fish. The default setting is OFF.Fish Sensit

48 DSM25 Owner’s HandbookThe temperature unit used (°C or °F) is dependent upon the Units parameter set in the System Set Up menu. The default setting

Chapter 5: Maintenance and Problem Solving 49Chapter 5: Maintenance and Problem SolvingThis chapter provides information on routine maintenance and on

5Chapter 5: Maintenance and Problem Solving ...495.1 Maintenance ...

50 DSM25 Owner’s HandbookUse only a water-based antifouling paint, or a water-based paint specifically designed for transducers. Apply the paint with

Chapter 5: Maintenance and Problem Solving 515.2 Resetting the SounderThere are two sounder resets available:• Power-on reset• Factory resetPower-on R

52 DSM25 Owner’s Handbook5.3 Problem SolvingAll Raymarine products are, prior to packing and shipping, subjected to comprehensive test and quality ass

Chapter 5: Maintenance and Problem Solving 53Status LEDThe LED on the unit front provides valuable information on the status of your DSM25. The LED bl

54 DSM25 Owner’s Handbook As an example, if the Transducer Sense fails and the network is not detected, the LED blinks amber once, pauses 1

Chapter 5: Maintenance and Problem Solving 55In the USAccessories and PartsMany Raymarine accessory items and parts can be obtained directly from your

56 DSM25 Owner’s HandbookThe Product Repair Center is open Monday through Friday 8:15 a.m. to 5:00 p.m. Eastern Time. All products returned to the Rep

57Appendix: SpecificationsGeneralSounder Features Approvals:CE - conform to EN60945:2002Size: 6.77" x 8.19" x 1.85" (172 x 2

58 DSM25 Owner’s Handbook81254.book Page 58 Monday, March 6, 2006 2:29 PM

59IndexAAccessories 18, 55Active Window 27Alarms 46Deep Alarm 47Deep Range 47Fish Alarm 47Fish Sensitivity 47Shallow Alarm 47Shallow Range 47Target

6 DSM25 Owner’s Handbook81254.book Page 6 Monday, March 6, 2006 2:29 PM

60 DSM25 Owner’s HandbookMMaintenance 49Manual Gain 30Max Ping Rate 45MenuDepth Digit Size 43Depth Lines 43Depth Offset 44Int Rej 45Max Ping Rate 45Pa

61TTarget Depth ID 46Technical Support 55Temp Alarm 47Temp Calibrate 44Temp Range 48Temperature Graph Page 26TransducerCable 22Cleaning 49Connection

62 DSM25 Owner’s Handbook81254.book Page 62 Monday, March 6, 2006 2:29 PM

7Important InformationIntended UseRaymarine DSM25 Digital Sounder Modules provide echo sounder data that can be displayed on A65 Multifunction Display

8 DSM25 Owner’s HandbookIf the transducer cable is accidentally removed while the DSM25 is powered on, remove power from the sounder module, replace t

Important Information 9• Raymarine specified cables are used. Cutting and rejoining these cables can compromise EMC performance and must be avoided u