SONAR TEST - When SONAR is affected by interference

This FAQ is part of our new series for troubleshooting Sonar systems. Here you will find guides to investigate and solve common issues with SONAR, including interference and settings. Whether you use an RV, RVM, or AIRMAR CHIRP SONAR system, we offer step-by-step instructions to ensure optimal performance. If you need help with installation or testing.

PART 1 - SONAR ERROR - No transducer connected investigation guide
PART 2 - Introduction to SONAR interference
PART 3 - SONAR interference investigation – Manual adjustment
PART 4 - SONAR SETTINGS & TEST - When SONAR is not affected by interference
PART 5 - SONAR SETTINGS & TEST - When SONAR is affected by interference
PART 6 - RV and RVM Transducer Sense Resistor Test

BE AWARE!

Before you proceed with troubleshooting and setting up your system, make sure your AXIOM has the latest software. Follow the link below to check the latest software version for your AXIOM and more information on how to update via WIFI or micro SD card. https://www.raymarine.eu/service-and-support/software-updates/mfds/lighthouse4/axiom-models/

The process below explains what to do when you have detected interference on a SONAR system. If you still see interference even with all (or most) devices in the system TURNED OFF and the engine OFF, follow our new guide which provides additional troubleshooting steps. If you are unable to perform all or parts of the suggestions below, you can ask for help from Product Support or an Authorized Raymarine dealer.

STEP 1. GROUNDING

Interference can be caused by poor or no grounding on a SONAR system. Make sure you follow the instructions from the installation manual for the SONAR module or AXIOM that acts as the primary sonar source installed onboard, and test to see if this resolves the interference issues.

You can download the latest version of any Raymarine manual by clicking the link below. https://www.raymarine.com/en-gb/support/raymarine-user-manuals

STEP 2. POWER SUPPLY

Isolate the power supply. This is done by isolating the power supply for the SONAR module or AXIOM and connecting it to an external battery that is not connected to anything else. Any power supply related issues will be eliminated this way.

SONAR module to AXIOM
Disconnect the SONAR module from the main power supply and connect it to an external power source as shown in the picture.

You do not need to change the AXIOM power supply if its internal SONAR is used. If this is the case, see example below.

AXIOM Internal SONAR
Disconnect AXIOM from the main power supply and connect it to an external power source as shown in the picture.

STEP 3. TRANSDUCER

Interference can be transferred from an external source to the transducer cable (cable routing) or the transducer itself. The best way to test if this is the case is to connect another transducer to AXIOM or the SONAR module, route the cable loosely (not through cable routing), and place the transducer on the side of the boat and in the water (at least 60 cm deep).

SONAR module to AXIOM
Turn off the SONAR module, disconnect the permanent transducer from the SONAR module and connect the new test transducer on the side of the boat.

Do not install the new transducer permanently and do not route the cable through any cable routing or vents. Route the cable loosely to the SONAR module.

AXIOM Internal SONAR

Turn off AXIOM, disconnect the permanent transducer from AXIOM and connect the new test transducer on the side of the boat.

Do not install the new transducer permanently and do not route the cable through any cable routing or vents. Route the cable loosely to AXIOM.

This concludes the last part of our Sonar Troubleshooting Guide series. If you still have problems with interference on your boat, do not hesitate to ask for help from Product Support or contact your local authorized Raymarine dealer.