We reserve the right to do so without notice. All features and specifications subject to change without notice. First, we want to thank you for buying a Lowrance sonar. Finally, in Section 6, we offer Supplemental Material, including a list of warranty and customer service information. A sonar consists of a transmitter, transducer, receiver and dis- play. The transmitter emits an electrical impulse, which the transducer con- verts into a sound wave and sends into the water.
The sound wave strikes an object fish, structure, bottom and bounces back to the transducer, which converts the sound back into an electrical signal. From the Sonar Page, press 2. Press the Menu key then repeatedly press or press and hold the down arrow key to scroll down the menu and select highlight the Sonar Features menu command. You should read over this entire installation section before drill- ing any holes in your vessel. The following installation types also call for these recommended tools and required supplies that you must provide supplies listed here are not included: Single-frequency transom installations Tools include: Left, vee pad hull; right, vee hull. A pod style transducer is shown here, but the principle is the same for Skimmers inside a hull. Transducer centerline Align transducer centerline with hull bottom. However, there are times when you may need to adjust the transducer slightly higher or lower. The slots in the mounting brackets allow you to loosen the screws and slide the transducer up or down. If you fre- quently lose bottom signal lock while running at high speed, the trans- ducer may be coming out of the water as you cross waves or wakes. Lack of angle adjustment can be particularly troublesome on hulls that sit with the bow high when at rest or at slow trolling speeds. Those hulls require either a transom mount or a thru-hull installation. Fourth, if your Skimmer transducer has a built in temp sensor, it will only show the temperature of the bilge, not the water surface temp. Place the ratchets into the holes in the bracket with the letter "B" aligned with the dot stamped in the bracket. Reassemble the transducer and bracket and place them against the transom.
Bolt Flat washer Assemble transducer and bracket. Once you determine the correct position for the ratchets, assemble the transducer as shown in the following fig- ure. Assemble transducer and bracket. Transom Transom Position transducer mount on transom and mark mounting holes. Side view shown, left, and seen from above at right. Attaching transducer to transom. Remove the transducer from the bracket and re-assemble it with the cable passing through the bracket over the bolt as shown in the following figures.
Flat-bottom hull Align transducer centerline with hull bottom and attach transducer to transom. Rear view of dual-frequency Skimmer shown. Route the transducer cable through or over the transom to the sonar unit. Make sure to leave some slack in the cable at the transducer. If possible, route the transducer cable away from other wiring on the boat. Trolling Motor Bracket Installation single-frequency only 1. Attach the optional TMB-S bracket to the transducer as shown in the following figure, using the hardware supplied with the transducer. The internal tooth washer is supplied with the TMB-S. Bolt Attach motor mounting bracket to transducer. Transducer aimed too far back Full fish arch Transducer angles and their effects on fish arches. If the arch slopes up — but not back down — then the front of the trans- ducer is too high and needs to be lowered. If only the back half of the arch is printed, then the nose of the transducer is angled too far down and needs to be raised. Careless grinding or cutting on your hull can result in damage that could sink your boat. Contact your boat dealer or manufac- turer to confirm your hull specifications. Fill with resin Flotation material Epoxy to hull first To choose the proper location for shoot-thru-hull mounting, follow these testing procedures: You may need a helper to complete these steps. Anchor the boat in about 30 feet of water. Add a little water to the sump of the boat. Plug the transducer into the sonar unit, turn it on, then hold the transducer over the side of the boat in the water. A brick or two might be sufficient to hold it in place.
The epoxy consists of the epoxy itself and a hardener. Remove the two compounds from the package and place them on the paper plate. Thoroughly stir the two compounds together until the mixture has a uniform color and consistency. Do not mix too fast or bubbles will form in the epoxy. Mount the sensor to the hull using 8 stainless steel wood screws not included. The thicker three-wire cable white, red and black is the power supply for your display unit. The thinner branch with three wires red, black and shield is the power cable for a NMEA network. When the unit is turned off but still connected to a power supply, electrolysis can occur in the power cable plug. Risk of electroly- sis corrosion is even greater when the cable is unplugged from the unit, but still connected to a power source. To unit All unused Data or NMEA power wires should be capped with wire nuts and electrical tape to prevent shorts. A drawing on the next page shows the dimensions of a gimbal-mounted sonar unit. You may need to place a piece of plywood on the back side of thin fiber- glass panels to reinforce the panel and secure the mounting hardware. After drilling the hole, pass the transducer connector up through the hole from under the dash. Portable Installation Like many Lowrance products, the unit is capable of portable operation by using an optional portable power pack. The power pack, a magnet- equipped antenna module and an optional portable transducer, ex- pands the uses for your sonar unit. The towel is highly effective in clearing away water spots, smudges and finger prints. When the unit is mounted in an unprotected area, such as an open boat cockpit, the protective face cover must be removed when the vehicle is moving at high speed.
This includes towing a boat on a trailer at highway speeds. The in- structions presented here in Sec. The material in Sec. ENT Enter — This key allows you to accept values or execute menu commands. Use this command to adjust how the screen looks under various lighting conditions. Sonar Page Display options left. The Full Sonar Chart is the main display option. This is a "cross- section" Split zoom page left with split frequency page X only right. Digital Data page display left with the Flasher page right. Sonar with Custom Gauge page left. Radar page display right. You can customize how the Sonar Page pictures and other data are dis- played in many ways. Section 4, but to show you how easy the sonar unit is to operate, the fol- lowing page contains a simplified, step quick reference that will cover most fish finding situations. The quick reference describes how your unit will operate with all the sonar features in their automatic modes, which are set at the factory.
Basic Sonar Quick Reference 1. Head for your fishing grounds. Your unit automatically displays digi- tal depth and surface water temperature in the corner of the screen. The auto settings will track the bottom, displaying it in the lower por- tion of the screen.
Sonar Operations As you can see from the quick reference on the previous page, basic operation is pretty easy, right out of the box. You can change the sensitivity level whether you are in Auto Sensitiv- ity mode or Manual Sensitivity mode.
The adjustment method works the same in both modes, but it gives you slightly different results. San Francisco Bay saw clouds of clutter in the water but no fish arches. When a down rigger was pulled up, it brought up several small jellyfish. The fishermen switched their Lowrance sonar to Fish I. Aside from being just plain fun, this program can help you learn both basic and advanced operations without burning boat fuel. Lowrance is the first sonar manufacturer to provide this type of training tool for customers. This automatic feature gives you the best display pos- sible under most conditions. To return to the previous page, press Alarms This unit has three different types of sonar alarms. The first is the Fish Alarm. It sounds when the Fish I.