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EM 710 sets a new accuracy record

Standard deviation in percent of water depth relative to beam angle in degrees
Standard deviation in percent of water depth relative to beam angle in degrees.

Sea Acceptance Test survey

From the 23rd to the 25th April the Norwegian Defence Research Establishment (FFI) using the research vessel HU SVERDRUP II conducted a Sea Acceptance Test survey for the newly installed EM 710, 0.5x1 degree multibeam echosounder system.

The system is installed in a gondola arrangement at 5.50 metre below waterline. The test was performed outside Harstad, Norway, with fairly calm sea conditions at depths varying from 200 to 250 metre.

In the first part of the survey, calibration of the system was performed with a performance analysis of the system. Several lines were run with 200 % overlap to check the repeatability of the soundings from the EM 710.

Manual and automatic calibration

The calibration of the system was done using both the manual and automatic routines available in the topside SIS software - Seafloor Information System. Afterward the results from both were compared. The automatic procedure is developed by FFI and implemented in the SIS as an option. The user gets an overview after the software has done an analysis of the recorded data. The results from both the manual and automatic method were the same, proving that auto-calibration is a cost effective solution.

Average error of 0.1 % of sea depth

From the data collected, the accuracy of the soundings was defined. The plot shows the standard deviation in percent of water depth relative to beam angle in degrees. On average the error is approximately 0.1 % of the sea depth with a maximum of 0.16 % of the sea depth.

The customer concludes that results from the performed test confirms that the EM 710 is the most accurate multibeam echo sounder ever produced. The customer further comments that they also had good data at 750 metre depth at sea state 5. The data density and the quality of the data was very good.

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