Calibration settings for HAC BioSonics channels

This page describes the settings, necessary to an Echoview calculation, on the Calibration page of the Variable Properties dialog box for acoustic variables derived from HAC data files.

We recommend you assess the suitability of the settings available on the Calibration pages for each acoustic variable. Some settings will be used to calculate data point values or ranges, others may be used during analysis or display of the data. The table below shows which settings are used for calculating data point values and ranges and which are used for other calculations. The tables also detail the parameters that are read from the data file and used to calculate range values.

Quantitative calculation/analysis requires calibrated data which is achieved using correct calibration setting values (rather than default values). An ECS file enables you to modify calibration settings for variables in a fileset.

Changes in calibration settings used for range calculations may shift ping data in the depth dimension but will not automatically adjust the position of regions and lines. You should review any existing regions and lines to ensure they are still valid. For more information refer to Range calculation effects on regions and lines.

Note: Data file values that have been used since the data was loaded or the ECS file was added, saved or removed are displayed in black text. Default values that have been used are displayed in orange text. Data file or ECS values that have been read but not used are displayed in grey text. Read About calibration settings for further information.

Table legend:


Setting is used in calculating data point values or ranges as indicated by the column heading.


Setting is not used in calculating data point values (when green background) or ranges (when blue background) but may be used for other purposes, see Additional uses of Calibration settings


Setting is not available for this variable

Variables from HAC files containing BioSonics model 102 tuples


Data point value (Sv)

Data point range

Calibration page of Variable Properties dialog box






















From data file

Start range



Stop range



Number of data points




  • Ping related values read from .hac files can be found under Ping (from file) on the Details dialog box (F9).
  • AbsorptionCoefficentLogging and SoundSpeedLogging are discussed under HAC Calibration notes.

See also

About calibration settings
Entering calibration settings

HAC data files

Raw variables derived from HAC data