PIRANHA I & 2 OPERATION GUIDE
Thank You Thank you for purchasing a Piranha fishfinder from Humminbird, Americas #1 Manufacturer of quality consumer marine electronics
WARNING! This device should not be used as a navigational aid to prevent collision, grounding, boat damage, or personal injury. When the boat is moving, water depth may change too quickly to allow time for you to react. Always operate the boat at very slow speeds if you suspect shallow water or submerged objects.

Powering ON and OFF

Press and release POWER-MENU to power the Piranha on. Press and hold POWER-MENU until the unit shuts down to power off. When Piranha powers on, the Start Up menu temporarily appears. From this menu, select either Start-Up for on-the-water use, or Simulator for learning to use the system with simulated sonar data. The Start-Up menu disappears after several seconds and the Piranha begins operation.

Installation Overview

Use the included installation guide to properly install your new Piranha. Installation must be done correctly to ensure best performance.
Screen Left Arrow Button Power/Menu Button Right Arrow Button

Using the Piranha

The Piranha is the easiest to use fishfinder ever. For most anglers, all youll ever need to do is Power On & Fish! The Piranha automatically determines depth and makes adjustments to keep the bottom and fish visible on the display. The Piranha uses sonar technology to send sound waves from the transducer into the water. The returned echoes are plotted on the Piranhas LCD display and create a very accurate picture of the underwater world with distance to underwater objects such as the bottom, fish and structure.

What You See On Screen

The Piranha displays underwater information in an easy-tounderstand format. The top of the display corresponds to the water surface, and the bottom of the display corresponds to the Depth Range automatically selected for the current water depth. The Bottom Contour varies between the two as the depth under the boat changes. Digital readouts provide precise information for depth, fish and water temperature (separate purchase required). *Note: Piranha 1s maximum depth is 240 feet. Piranha 2s maximum depth is 600 feet.
Water Surface Line Depth Measured at the Transducer Water Temperature Capable (Optional purchase required) Fish Icons Fish ID Symbol w/ Fish Depth Structure ID Bottom Contour Depth Range*
Understanding the On-screen Images
As the boat moves, terrain and bottom composition variations are displayed on-screen. Fish, bait fish and thermoclines (underwater temperature changes) are displayed when detected. Underwater conditions vary greatly, so some experience and interpretation is needed to realize all the benefits of the Piranha use the picture below as a guide to the most common conditions and practice using the Piranha over known bottom types.
Water Surface Line Depth Measured at the Transducer Thermocline Fish ID Bait fish Structure Rocky Bottom Depth Contour Soft Bottom Hard Bottom
(Setting Saved in Memory, Defaults to OFF)
Press POWER-MENU until the LIGHT menu appears. Select either OFF, LOW or HIGH to activate the backlight at the desired level. Note: Continuous backlight operation significantly decreases battery life on Piranha Portables.

Sensitivity

Press POWER-MENU until the SENSITIVITY menu appears. Select a higher number to show smaller sonar returns on-screen, or a lower number to remove clutter from the screen. Adjusting Sensitivity also affects how sonar returns are identified as Fish ID Symbols - more fish will be detected at a higher setting, fewer at a lower setting. 5 is the Factory Setting.

Low Sensitivity

Accessing Menu Features
A simple menu system accesses Piranhas adjustable features. To activate the menu system, press POWER-MENU and a menu appears. Press POWER-MENU repeatedly to access other Piranha menus one at a time. When a menu is on the display, use the right and left arrow keys to adjust the menu. Menus automatically are removed from the screen after several seconds. Note: Each time POWER-MENU is pressed, the backlight momentarily illuminates for easy viewing at night. Adjust the Light menu setting to keep the light on. Note: If Simulator Mode is selected from the Startup Menu and a transducer is plugged in, menu settings are saved in memory. Menu settings are not saved from Simulator mode without a transducer connected.

Normal Sensitivity High Sensitivity

Depth Range Menu

Press POWER-MENU until the Depth Range menu appears. Select AUTO to have the Piranha automatically select the Depth Range or manually select 15, 30, 60, 120, 180, or 240 ft. for Piranha 1 and, in addition 360, 480 or 600 ft. for Piranha 2. This locks the depth range to a specific setting. Note: In manual operation, if the depth is greater than the depth range setting, the bottom will not be visible onscreen. Select AUTO to return to automatic operation.
Menu Title Setting Button Changes A button has no function when the menu arrow is not displayed.

Bottom View Menu

Depth Alarm
Note: Bottom View is a Piranha 2 Feature Only Press POWER-MENU until the Bottom View menu appears. Select Structure ID to gain bottom hardness and enhanced structure definition; Select Bottom Black for a high contrast, easy to view from a distance bottom picture.
Press POWER-MENU until the DEPTH ALARM menu appears. Select OFF for no Depth Alarm; select a number from 3-99' to set the alarm depth point and turn it on. An audible alarm sounds when the depth is equal to or less than the setting.

Fish Alarm

Press POWER-MENU until the FISH ALARM menu appears. Select OFF for no fish alarm, or one of the following symbols to set the alarm point and turn it on.
Alarms on big fish only. Alarms on big and medium fish only. Alarms on all fish.

Fish ID

Bottom Black Mode
Press POWER-MENU until the Zoom menu appears. Select ON to magnify the area around the bottom thus revealing fish and structure close to the bottom that may not be visible in typical operation. In Zoom, the Piranha continually changes the upper and lower Depth Range to keep area just above and below the bottom on the display. Select OFF to return to normal operation.

Upper Zoom Range

Press POWER-MENU until the FISH ID menu appears. Select either OFF to view raw sonar returns, or ON to take advantage of Piranhas ability to identify sonar returns that are determined to be a fish. A select number of possible fish returns will be displayed with depth.

Fish ID Raw Sonar

Structure
Magnified Bottom with More Detail

Lower Zoom Range

Maintenance
Your Piranha is designed to provide years of trouble-free operation with virtually no maintenance. Follow these simple procedures to ensure your Piranha continues to deliver top performance. If the unit comes into contact with salt spray, wipe the affected surfaces with a cloth dampened in fresh water. Do not use a chemical glass cleaner on the lens - this may cause cracking in the lens. When cleaning the LCD protective lens, use a chamois and nonabrasive, mild cleaner. Do not wipe while dirt or grease is on the lens. Be careful to avoid scratching the lens. If your boat remains in the water for long periods of time, marine growth can reduce the effectiveness of the transducer. Periodically clean the face of the transducer with liquid detergent. If your boat remains out of the water for a long period of time, it may take some time to wet the transducer when returned to the water. Small air bubbles can cling to the surface of the transducer and interfere with proper operation. These bubbles dissipate with time, or you can wipe the face of the transducer with your fingers after the transducer is in the water. Never leave the unit in a closed car or trunkthe extremely high temperatures generated in hot weather can damage the electronics.

Check the power connection to the Piranha. It is possible to force the power cable connector into the cable holder incorrectly. If the connector is reversed, the unit will not work. Examine the contacts on the back of the unit to ensure there is no corrosion.
2. There is no transducer detected.
The Piranha has the ability to detect and identify that a transducer is connected. When Powering on, if a message indicates transducer not connected, ensure that an appropriate transducer connector is plugged into the unit. Second, inspect the transducer cable from end to end for breaks, kinks, or cuts in the outer casing of the cable. Also ensure the transducer is fully submerged in water. If the transducer is connected to the unit through a switch, temporarily connect it directly to the unit and try again. If none of these items identifies an obvious problem, the transducer itself is probably the problem. Be sure to include the transducer if returning the unit for repair.
3. There is no bottom reading visible on the display.
If the loss of bottom information occurs only at high boat speeds, the transducer needs adjusting see the Piranha Installation Guide. Also, in very deep water, it may be necessary to manually increase the sensitivity setting to maintain a graphic depiction of the bottom. If you are using a transducer switch to connect two transducers to the Piranha, ensure the switch is in the correct position to connect a transducer that is in water. (If a trolling motor transducer is selected and the trolling motor is out of water, no sonar information appears.) If none of the above solve the problem, inspect the transducer cable from end to end for breaks, kinks, or cuts in the outer casing of the cable. If the transducer is connected to the unit through a switch, temporarily connect it directly to the unit and try again. If none of these items identifies an obvious problem, the transducer itself may be the problem. Be sure to include the transducer if returning the unit for repair.

Troubleshooting

Do not attempt to repair the Piranha yourself. There are no user serviceable parts inside, and special tools and techniques are required for assembly to ensure the waterproof integrity of the housing. Repairs should be performed only by authorized Humminbird technicians. Many requests for repair received by Humminbird involve units that do not actually need repair. These units are returned no problem found. If you have a problem with your Piranha, use the following troubleshooting guide before calling the Customer Resource Center or sending your unit in for repair.
4. When in very shallow water, I get gaps in the bottom reading and inconsistent digital depth indication.

The Piranha will work reliably in water 3 (.9m) or deeper. The depth is measured from the transducer, not necessarily from the surface.
1. Nothing happens when I turn the unit on.
Check the power cable connection at both ends. Be sure the cable is connected correctly to a reliable power source red lead to positive, black lead to negative or ground. Ensure the power available is between 8 and 20 VDC. If the unit is wired through a fuse panel, ensure the panel is powered. Often accessory fuse panels are controlled by a separate switch or the ignition switch. Also, often a fuse can appear to be good when it is not. Check the fuse with a tester or replace it with a fuse known to be good.
5. The unit comes on before I press POWER, and wont turn off.
Check the transducer cable if the outer jacket of the cable has been cut and the cable is in contact with bare metal, you will need to repair the cut with electrical tape. If there is no problem with the cable, disconnect the transducer from the unit and see if the problem is corrected, to confirm the source of the problem.
6. I get gaps in the reading at high speeds.
Your transducer needs adjusting. If the transducer is transommounted, there are two adjustments available to youheight, and running angle. Make small adjustments and run the boat at high speeds to determine the effect. It may take several tries to optimize high-speed operation. This can also be a result of air or turbulence in the transducer location caused by rivets, ribs, etc.

Customer Resource Center

If you have any questions, call our Humminbird Customer Resource Center Hotline:

1-334-687-0503

Throughout the U.S. and Canada, hours are Monday-Friday, 8:00 a.m. to 5:00 p.m. Central time. Or visit our web site: www.humminbird.com for Product Support and troubleshooting guides. If after reading Troubleshooting you determine your unit needs factory service, please attach a description of the problem and send it with the unit with any accessories to the address below. If you are including a check, please attach it to the unit.
7. My unit loses power at high speeds.
Your Piranha has over-voltage protection that turns the unit off when input voltage exceeds 20 VDC. Some outboard motors do not effectively regulate the power output of the engines alternator and can produce voltage in excess of 20 volts when running at high RPMs. The SureVolt power stabilizer from Humminbird maintains a steady voltage to the unit and solves this problem.
Humminbird Service Department 108 Maple Lane Eufaula, AL 36027
8. The screen begins to fade out. Images are not as sharp as normal.
Check the input voltage. The Piranha will not operate on input voltages below 8 VDC.
9. The display shows many black dots at high speeds and high sensitivity settings.
You are seeing noise or interference caused by one of several sources. Noise can be caused by other electronic devices. Turn off any nearby electronics and see if the problem goes away. Noise can also be caused by the engine. If engine noise is causing the interference, the problem will intensify at higher RPMs. Increase the engine speed with the boat stationary to isolate this cause. Propeller cavitation can appear as noise on-screen. If the transducer is mounted too close to the propeller, the turbulence generated can interfere with the sonar signal. Ensure that the transducer is mounted at least 15" (38cm) from the prop.

erglass Hulls Cut and use for Fib Align with transom. minum Hulls Cut and use for Alu

Transducer botto

Place on bottom of hull
Humminbird One-Year Full Warranty
First year repairs (from original date of purchase) on your Piranha are absolutely free. This does not include physical damage to the unit or its accessory items. Any modification or attempt to repair the original equipment or accessories by unauthorized individuals will void the warranty. Return the warranty registration card and retain your bill of sale for warranty verification. Accessories not manufactured under the Humminbird trade name are not covered by our warranty. The customer is responsible for shipping charges to Humminbird. Humminbird will provide ground UPS or Parcel Post shipping back to the customer free of charge. This warranty applies to the original purchaser only. This warranty is in lieu of all other warranties expressed or implied and no representatives or persons are authorized to provide for any other liability in connection with the sale of our products. Humminbird reserves the right to perform modifications or improvements on its products without incurring the obligation to install the changes on units previously manufactured, sold, delivered, or serviced. THIS IS A FULL WARRANTY AS DEFINED BY THE FEDERAL WARRANTY ACT, EFFECTIVE JULY 4, 1975.

Fiberglass

Aluminum

Transducer Guide

Use 4mm (") drill bit & drill two holes for hull type Drill
15", 380mm from prop(s).

Drill

For use with bracket PN 404329-1
PLACE EITHER ARROW ON DEADRISE ANGLE
Remove and use for Transducer Installation
PLACE EITHER CORNER ON DEADRISE ANGLE
DO NOT LET DEADRISE INTERSECT THIS LINE

Use 5/32" drill bit

PIRANHA I & 2 INSTALL GUIDE
Two components need to be installed on the boat: the transducer and the control head. The control head displays sonar information, the transducer sends and receives sonar signals into the water. Proper installation of each insures best performance of the Piranha and provides the greatest enjoyment and functionality. Due to the wide variety of boats only general instructions are presented in this installation guide. Each boat has unique characteristics that need to be evaluated.

Turbulence

The mounting area must be in contact with the water when the boat is on plane. If the boat is trailered, make sure that the transducer is not inline with trailer bunks or roller assembles that could damage the transducer during loading operations.
You will need: Hand drill and various bits, Phillips #2 & 3 drivers, pencil, silicone sealant (for drilled holes), 2-part, slow cure epoxy for inside hull transducer mounting, 12v DC power supply, 1 ampere fuse.
Figure 2, Location of turbulence
INSTALLING THE TRANSDUCER
STEP 1: DETERMINE TRANSDUCER LOCATION Consider the following to find the best location on the transom: Choose an area free of turbulent water. Turbulence is generated as the boat moves through the water and is confined to area aft of ribs, strakes and rivet lines on the bottom of hull. Choose a location on the transom where the hull forward of this location is smooth, flat and free of protrusions or ribs. Turbulence is also created by the prop - try to keep at least 380mm (15") from the prop(s). The best method to locate areas free of turbulence is to watch the transom while the boat is moving. For best high-speed performance this is recommended. Have an assistant pilot the boat and use caution! Stepped hulls require the transducer be mounted on the step if possible. Never mount the transducer on the transom behind the step. If propellers are forward of the transom, clear water may be impossible to find. A different transducer or mounting method should be considered, (see optional inside hull instructions below). STEP 2: FOR TRANSOM MOUNTING: DRILL THE MOUNTING HOLES
1. Remove the mounting template from the last page of Operation Section (Page O-15). This template provides a means of locating the two mounting holes which must be drilled. 2. Hold the template on the transom of the boat in the location where the transducer will be installed. Align the template vertically with the inside arrow of the template on the deadrise where the bottom of the hull meets the transom wall. (Figure 3 ). 3. Using a pencil or punch, mark the location of the two mounting holes on the transom. 4. Using a 4mm (") bit, drill the two holes to a depth of approximately 25mm (1"). On fiberglass hulls, it is best to start with a smaller bit and use progressively larger drill bits to reduce the chance of chipping or flaking the outer coating.
TOP Use 5/32" drill bit
DO NOT LET DEADRISE INTERSECT THIS LINE
PLACE EITHER CORNER ON DEADRISE ANGLE
PLACE EITHER ARROW ON DEADRISE ANGLE

15"

Figure 3
Figure 1. Mounting locations include transom and inside hull.

STEP 3: ASSEMBLE & MOUNT THE TRANSDUCER
1. Attach the Transducer Body to the Bracket using the hardware shown below. 2. Tighten the Pivot Bolt just enough so the transducer can rotate, but remain in a place when released. 3. Apply silicone sealant into the drilled mounting holes. 4. Align the transducer with the mounting holes and attach with Phillips screws provided. 5. Tighten the Mounting Screws just enough so the transducer can move vertically, but remain in a place when released.
Mounting Bracket Star lock washers Pivot Nut Cable Pivot Bolt -20, #3 Phillips Drive Transducer

Figure 4

STEP 5: ROUTE THE CABLE The cable must be routed to where the control head will be mounted. Consider the following: The easiest method to get the cable into the boat routes the cable over the transom. The most common method drills a hole through the transom, above the water line. Once inside the boat, the cable routes through or along internal conduits and channels. Keep the cable as far away as possible from VHF radio antenna and tachometer cables. Do not cut, shorten or lengthen the transducer cable. If the cable is too short, extensions are available at your dealer or direct from Humminbird. FOLLOW THESE STEPS: 1. Run the cable over the transom or through a 16mm (") hole drilled well above the water line. 2. If a hole was drilled, fill it with silicone sealant. 3. Secure the cable with clamps as shown. (Figure 6).

Cable Clamps

Note: A third mounting screw location is provided in the mounting bracket. Drill and install this ONLY after final testing and adjustments have been made. STEP 4: ADJUST THE TRANSDUCER
Correct transducer height and running angle settings are needed to ensure best performance at all boat speeds. Use the template provided (pg. O-15) to make the initial setting for most boats. Some boat hulls require adjustments beyond these settings for best performance at all speeds. 1. Cut out the transducer templates from the Piranha package printed template insert following the cutting directions for your boat hull. 2. Adjust the height on the transom and the pivot bolt angle to match guides on the template as shown. 3. Hand tighten the Pivot Bolt and Mount Screws at this time. Ensure the height and angle have not changed.

Transducer

Transducer bottom

6" 150mm

Note: Allow enough slack in the cable for the transducer to pivot. Route the cable to side of the transducer.

Figure 6

INSTALLING THE CONTROL HEAD
STEP 1: ASSEMBLE THE BASE 1. Insert the Mount Arms through the Base. 2. Secure the Mount Arms with the 4 screws provided.

Arm Screws, 4 #6 x "

Place on bottom of hull

rglass Hulls Cut and use for Fibe Align with transom. inum Hulls Cut and use for Alum

Fiberglass

Aluminum

Transducer Guide

Left Arm Right Arm
Templates supplied locating the transom bracket and adjusting the transducers position. Figure 5

Figure 7

STEP 2: ATTACH THE CONTROL HEAD TO THE BASE 1. Insert the Pivot Bolt through the Pivot Knuckle on the control head. 2. Thread the Gimbal Knob onto the Pivot Bolt using only 2-3 turns. 3. Align the Pivot Knuckle with the Mount Base Arms and slide into place until it seats firmly. A slight twist will aid in seating the unit. 4. Rotate the Control Head to the desired angle and hand tighten the Gimbal Knob. Now you can use the assembled Piranha to identify the best mounting location.
Ensure enough space exists for easy control head installation and removal and for pivoting through its full range of motion. The mounting area should be well supported to protect the fishfinder from wave shock and vibration. Choose an area that provides good visibility for the Piranha.
STEP 4: ELECTRICAL CONNECTIONS A 2m (6) long power cable is included to supply power to the fishfinder. You may shorten or lengthen the cable using 18 gauge multi-stranded copper wire. CAUTION: Some boats have 24 or 36 volt electric systems. Be sure your unit is connected to a 12 VDC power supply. Humminbird is not responsible for over current or over voltage failures.
Pivot Bolt Gimbal Knob Pivot Knuckle Figure 8 Figure 10

GROUND

POSITIVE

Figure 11

STEP 3: DETERMINE CONTROL HEAD MOUNTING LOCATION When choosing a mounting location consider the following: Power and transducer cables should be installed first and must reach the control head. Transducer extension cables are available. The power cable can be shortened or lengthened with 18 gauge wire. If possible, choose a location that provides access from below so above deck cable length is short, and the cables hole can be covered by the mount base.
Cabling can be routed through a 16mm hole centered between the two rear mounting holes of the base.

The power cable can be connected to the boats electrical system at two places: a fuse panel, usually located near the console, or directly to the battery. If a fuse terminal is available, use crimp-on type electrical connectors (not included) that match the terminal on the fuse panel. Attach the black wire to ground and the red wire to 12 VDC power (Figure 10). Be sure to use a one amp fuse in the connection. If you must wire the control head directly to a battery, be sure to install an inline fuse holder and use a one amp fuse (not included) for the protection of the unit (Figure 11). In order to minimize the potential for interference with other marine electronics a separate power source (such as a second battery) may be necessary. STEP 5: INSTALL THE BASE
1. Remove the control head from the mount base by loosening the gimbal knob and pulling the unit from the base - a slight twisting motion will help to release it. Note: It is not necessary to completely remove the gimbal knob. Unscrew only enough to permit the unit to release. 2. Using the mount base as a template, mark the location for the mounting holes. 3. Drill the mounting holes using a 3.5mm (") bit.

Figure 9

4. Drill a 16mm (") hole at the location where the cables pass through the mounting surface. If access is possible underneath mounting surface, drill the hole so the mount base forms a hole cover. See Figure 9 for location of cable hole under the mount. 5. Pass the transducer and power cables through the 16mm inch hole, leaving about 150mm length above the surface. 6. Align the mount base with the holes and attach with the Phillips screws provided.
If the bottom is visible on-screen with digital depth readout the unit is working properly. If no bottom is visible or erratic operation occurs, ensure that the unit is in water greater than 1 meter (3') and the transducer is fully submerged in water. Remember, sonar signals can not travel through air. If the unit is working properly, gradually increase boat speed to test higher speed performance. If the unit functions well at low speeds but begins to skip or miss the bottom at higher speeds, the transducer requires adjustment.
Note: Transducer installation often requires several incremental adjustments before optimum high-speed performance is achieved.
STEP 6: ATTACH THE CONTROL HEAD AND PLUG IN CONNECTORS
1. Mount the control head to the base. 2. With attention to shape and orientation of the plugs, insert the transducer and power cable into the correct socket according to the figure below.

Temperature

3. With the control head in place, tilt the unit through its full range to ensure enough cable slack is left for movement. Hand tighten the gimbal knob when at its desired position.
To optimize transducer installation, try the following. Ensure the transducer is NOT located in an area of turbulent water. First, incrementally lower the running depth by 1.5mm (") until best high-speed performance is achieved. If the bracket is fully extended and high-speed performance continues to need adjustment, incrementally change the Pivot Angle to lower the rear of the transducer by 3mm (") steps until best highspeed performance is achieved. Important: For transom mount transducers, install the third mounting screw after final transducer adjustments. Hand tighten only!
OPTIONAL INSIDE HULL TRANSDUCER MOUNTING
Inside the hull installation requires the control head to be installed and operational. Inside the hull mounting generally produces good results in single thickness fiberglass-hulled boats. Humminbird cannot guarantee depth performance when transmitting and receiving through the hull of the boat, since some signal loss Figure 13 occurs. The amount of loss depends on hull construction, hull thickness and the installation. This installation requires slow-cure two-part epoxy. Do not use silicone or any other soft adhesive to install the transducer, as this material reduces the sensitivity of the unit. Five minute epoxy has a tendency to cure before all the air bubbles can be purged.
YOUR NEW HUMMINBIRD IS NOW READY FOR OPERATION! TEST & COMPLETE INSTALLATION Testing should be performed with the boat in the water, however, you can initially confirm basic operation with the boat trailered. Press POWER-MENU once to turn the unit on. An audible chirp sounds any time a button is pressed. If the unit does not power on, ensure the cable plugs are fully seated and there is power available. The first screen indicates either Start-Up or Simulator. If the unit detects the transducer, Start-Up will be the default selection. If no transducer is detected, Simulator will be selected. Use the Arrow keys to change between Start-Up and Simulator. Note: The transducer must be submerged in water for reliable transducer detection. If the transducer is detected, after several seconds the Piranha will begin operation unless you choose another option. If the boat is in the water sonar data begins to scroll across the screen.
STEP 1: INSTALL THE CONTROL HEAD Follow directions above for installing the control head. STEP 2: DETERMINE THE MOUNTING LOCATION Begin the transducer installation by determining where inside the hull to install the transducer. Consider the following to find the best location: Observe the outside of the boat hull to find the areas that are mostly free from turbulent water. Avoid ribs, strakes and other protrusions as these create turbulence (Figure 2). As a general rule, the faster the boat can travel, the further aft and closer to the centerline of the hull the transducer has to be located to remain in contact with the water at high speeds (Figure 13). STEP 3: TEST THE MOUNTING LOCATION There is no opportunity for adjustment after the transducer is glued in place. Therefore, it is best to perform a trial installation on inside the hull transducers first, and run the boat at high speeds to determine the best mounting area. 1. At the identified mounting location, lay the transducer body face down with the pointed end towards the bow. 2. Fill the hull with enough water to submerge the transducer body. Use a sand filled bag or other heavy object to hold the transducer in position. The transducer cannot transmit through air. The water purges any air from between the transducer and the hull, and fills any voids in the coarse fiberglass surface. 3. Power up the Control Head. 4. Run the boat at various speeds and water depths while observing the screen on the Control Head. If the unit functions well at low speeds but begins to skip or miss the bottom at higher speeds, the transducer needs to be moved. If depth performance is required, test the fishfinder in water at the desired depth. Test different locations in the hull until the optimum performance is achieved.

5. Press the transducer into place with a slight twisting motion to purge any trapped air from underneath, keeping the pointed end of the transducer body pointed forward (Figure 14). 6. Weight the transducer so it does not move while the epoxy is curing. When the epoxy cures, no water is necessary inside the hull. Neither water, spilled gasoline, nor oil will affect the performance of the transducer.

Figure 14

STEP 4: PERMANENTLY MOUNT THE TRANSDUCER Once the mounting location is determined, mark the position of the transducer. Remove the water from inside the hull and thoroughly dry the mounting surface. If the surface is excessively rough, it may be necessary to sand the area to provide a smooth mounting surface. Ensure the mounting area is clean and dry. Mix an ample quantity of two-part slow-cure epoxy slowly and thoroughly. Avoid trapping air bubbles. Coat the face of the transducer and the inside of the hull.