Introduction

Before starting any hydrographic survey, the Single Beam Echo Sounder should be installed correctly on the survey vessel. The transducer, GNSS receiver, survey computer, and software must all work together to collect reliable depth and position data.

A careful setup improves survey accuracy and ensures high-quality bathymetric results.

Equipment Required

Before starting the survey, make sure you have the following equipment:

• Single Beam Echo Sounder
• Transducer
• GNSS Receiver
• GNSS Antenna
• Survey Computer
• Hydrographic Survey Software
• Power Supply
• Mounting Pole or Bracket
• Survey Vessel

Step 1 – Prepare the Survey Vessel

Park the survey vessel in calm water before installing the equipment.

Check that all equipment is clean, secure, and ready for use.

Confirm that the batteries or power supply are fully charged.

Step 2 – Install the Transducer

Mount the transducer firmly on the side or hull of the survey vessel using a suitable mounting bracket.

The transducer should remain below the water surface during the entire survey.

Make sure nothing blocks the sound beam.

Step 3 – Install the GNSS Antenna

Install the GNSS antenna on the highest practical point of the survey vessel.

The antenna should have a clear view of the sky to receive strong satellite signals.

Measure the antenna height and horizontal offsets accurately for use in the survey software.

Step 4 – Connect the Equipment

Connect the Single Beam Echo Sounder, GNSS receiver, and survey computer.

Check that all cables are secure and protected from water.

Switch on each device and confirm that communication between the instruments is working correctly.

Step 5 – Open the Survey Software

Start the hydrographic survey software.

Create a new project or open an existing survey project.

Enter the correct coordinate system, projection, and survey settings before collecting data.

Step 6 – Enter the Vessel Offsets

Measure and enter the distance between the GNSS antenna and the transducer.

Also enter the vertical distance from the waterline to the transducer face.

These measurements are important for accurate positioning and depth calculations.

Step 7 – Enter the Draft Value

Measure the vessel draft before starting the survey.

Enter the draft value into the survey software.

This allows the software to calculate the correct water depth from the transducer to the seabed.

Step 8 – Check the Depth Reading

Move the survey vessel into the survey area.

Compare the displayed depth with a known depth or a staff measurement if available.

If the readings are correct, the system is ready for data collection.

Step 9 – Start the Survey

Follow the planned survey lines at a steady speed.

Monitor the depth values, GNSS position, and data quality throughout the survey.

Record the data continuously until all survey lines are completed.

Common Mistakes to Avoid

Incorrect transducer installation, wrong antenna offsets, incorrect draft values, loose cables, and poor GNSS signals can reduce survey accuracy.

Always verify all measurements before starting the survey.

Best Practices

Inspect the transducer before every survey.

Keep the survey vessel moving at a steady speed.

Check GNSS quality throughout the survey.

Save the survey data regularly.

Calibrate the equipment according to the manufacturer’s recommendations.

Conclusion

A properly installed Single Beam Echo Sounder provides reliable and accurate water depth measurements. Following the correct setup procedure helps surveyors collect high-quality bathymetric data for rivers, lakes, canals, ports, and coastal engineering projects.