SONAR TEST - Interference Investigation – Manual Setup

Manual Setup of Raymarine SONAR – Step-by-Step Guide for Sensitivity, Range, and Interference Analysis.

This FAQ is part of our series for troubleshooting SONAR systems. Here you will find detailed guides to investigate and resolve common SONAR issues, including interference and settings. Whether you are using an RV, RVM, or AIRMAR CHIRP SONAR system, we offer step-by-step instructions to ensure optimal performance. Do you need help with installation or testing? Then this is the right place.

Related Guides

PART 1 – SONAR ERROR: No Transducer Connected
PART 2 – Introduction to SONAR Interference
PART 3 – SONAR Interference Investigation – Manual Setup
PART 4 – SONAR Setup & Test: When SONAR is not affected by interference
PART 5 – SONAR Setup & Test: When SONAR is affected by interference
PART 6 – RV and RVM Transducer Sense Resistor Test

Important Preparations

NOTE: If you are not familiar with these systems, contact Product Support or an authorized Raymarine Dealer for assistance with setup and testing.

Ensure your AXIOM has the latest software before proceeding. Check the latest version here.

Manual Setup and A-Scope

For testing purposes, enable A-Scope only and turn off features like Bottom Fill.

Step 1 – Select Frequency

1. Press MENU.
   
2. Select CHANNEL, HIGH CHIRP, and the SONAR source you want to use (example: internal SONAR on AXIOM 2 PRO RVM).
   

Step 2 – Adjust Sensitivity

1. Open the Sonar Sensitivity menu.
   
2. Uncheck AUTO and set Surface Filter to 0%.
   
3. Set INTENSITY to 15%.
   
4. Adjust GAIN: start at 30% and increase until the bottom return reaches the left edge of the A-Scope.
   
   

Step 3 – Range Setting

1. Press MENU and uncheck Auto Range.
   
2. Manually lower the range to 100 m in shallow water.
   

Analysis of SONAR Returns

With the correct settings, your SONAR screen should look like the image below:

Avoid too low or too high GAIN:

Test Configuration and Interference Analysis

Perform tests with both AUTO and MANUAL range to identify interference. Follow these steps:

• Boat stationary, all devices off.
• Turn on devices, then the engine.
• Increase speed to 4 knots.

Analyze the results to determine if interference is caused by devices, engine, or transducer installation.