Garmin GPSMAP 541s Installation Instructions - Page 4

To mount the transducer on a transom: 1. Position the transducer mount at the selected transom location. Make sure the transducer is parallel with the water line. Mark the center locations of each hole on the transducer mount. Apply marine sealant to all screw threads to prevent water from seeping into the transom. The transducer should extend 1/8 in. (3.2 mm) below a fiberglass hull or 3/8 in. (9.5 mm) below an aluminum hull. Mount the transducer cable cover far above the waterline. Ensure that the transducer is below water level when the boat is on plane at high speed. Mount the transducer parallel with the bottom. Do not mount the transducer directly in the path of the propeller. The transducer can cause cavitation that may degrade the boat performance and damage the propeller. 2. Drill 5/32 in. (4 mm) pilot holes approximately 1 in. (25 mm) deep at the marked locations. To avoid drilling the holes too deep, wrap a piece of tape around the bit at 1 in. (25 mm) from the point of the bit. 3. Apply marine sealant to the 5 × 30 mm screws (B). Attach the transducer assembly to the transom using the 5 × 30 mm screws. Adjust the transducer assembly to extend beyond the bottom of the transom approximately 1/8 in. (3.2 mm) on fiberglass hulls or 3/8 in. (9.5 mm) on aluminum hulls. Adjust the transducer assembly to be aligned parallel with the bottom. 4. Tighten the 10-32 locking nut until it touches the mounting bracket, and then tighten 1/4 turn more. (Do not overtighten.) 5. Place the first cable clamp (F) on the transducer cable, approximately one third of the distance between the transducer and the top of the transom. 6. Mark the location. Drill a 1/8 in. (3.2 mm) pilot hole approximately 3/8 in. (9.5 mm) deep. 7. Attach the cable clamp using one of the 4 × 12 mm screws (D). Coat the screw with marine sealant before installation. Repeat steps 5 and 6 using the other cable clamp. 8. Route the transducer cable to the GPSMAP 400/500 series chartplotter. Notice: Avoid routing the cable close to electrical wires or other sources of electrical interference. 9. Test the transducer installation after you complete the GPSMAP 400/500 series chartplotter installation. See page 9. Mounting a Transducer on a Trolling Motor 1. With the ridges of the band facing up, slide the large cable tie through the slot on the transducer mount until equal lengths extend on both sides of the mount. notice: For cold water and heavy timber or debris areas, a metal 4-5 in. (100-125 mm) worm gear clamp is recommended instead of the plastic cable tie. 2. Position the mount gasket on the curved top of the transducer mount. 3. With the front of the transducer pointed away from the trolling motor propeller, place the transducer assembly against the motor body of the trolling motor. 4. Wrap the two ends of the cable tie around the motor body. Place the pointed end of the cable tie through the fastener hole on the opposite end and pull it through until it is snug but not tight. (The cable tie clicks when you pull it.) 5. Position the transducer so that it is parallel with the bottom when in use, making sure the gasket is aligned properly. Pull the cable tie end until tight. Trim off the excess if necessary. Tighten the locking nut until it touches the mounting bracket, and then tighten 1/4 turn more. (Do not overtighten.) Cable tie Front of the transducer  GPSMAP 400/500 Series Installation Instructions