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Born in Hobart, raised in Brisbane with stints in Melbourne and Adelaide, Gareth has 15 years’ experience in sales, marketing and leading high performance teams.
It has come to our attention that incorrect values of transducer gain could be used in the calculation of wideband TS and Sv variables for Simrad EK80 data.
Simrad data files contain a lookup table of pulse durations, with corresponding tables for gain and Sa correction. When a ping is read from file it lists the pulse duration that was used when the ping was recorded. The corresponding value of gain and Sa correction is read from the lookup table and used accordingly.
EK80 data files can include both PulseDuration and PulseDurationFM attributes. Echoview was incorrectly using the PulseDurationFM lookup table for wideband data when PulseDuration should have been used. Depending on a user’s setup, this could mean that an incorrect value of gain is applied when calculating wideband TS and Sv variables. The attributes can be viewed by opening an EK80 data file with a text editor.
Would you like to compare and explore data more easily? Echoview 12 includes the ability to duplicate the mouse pointer across all visible echogram, graph, and cruise track windows, making it easy to inspect and cross-reference your data.
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