Use of sound speed in Simrad Ex60 and Ex500 calculations
Refer to this table for sound speed calculations for
Description 

c1 
1470.0 
c2 
1470.6 
c3 
Perping sound speed stored in data file 
c4 
User defined. Entered on the Calibration page of the Variable Properties dialog box (single setting) 
c5 
User defined. Entered on the Calibration page of the Variable Properties dialog box ("logging" setting) 
c6 
User defined. Entered on the Calibration page of the Variable Properties dialog box ("processing" setting) 
Note: c3 is not used.
The sound speed(s) used in variables derived from the following data files is documented below:
EK500: ek5, dgn, CSIRO raw, BI500 files
Sv (Q telegrams) and sample Sv (V telegrams)
TS (Q telegrams) and sample TS (P telegrams)
Single target detections (E telegrams)
Sv from Power (W telegrams)
TS from Power (W telegrams)
Angular position (B telegrams)
Sv (Q telegrams) and sample Sv (V telegrams)
With calibration correction
Variant 
Sound speed calculation 
Adjusting the range of each sample 

Adjusting the Sv value of each sample 
With no calibration correction
Not used
TS (Q telegrams) and sample TS (P telegrams)
With calibration correction
Variant 
Sound speed calculation 
Adjusting the range of each sample 

Adjusting the TS value of each sample 
With no calibration correction
Not used
Single target detections (E telegrams)
With calibration correction
Variant 
Sound speed calculation 
Adjusting the range of each target 

Adjusting the TS value of each target 

ST thickness calculation 
With no calibration correction
c5 used for ST thickness calculation
Sv from power (W telegrams)
Variant 
Sound speed calculation 
TS from power (W telegrams)
c1 used for TVG range correction
Angular position (B telegrams)
Not used
Ex60: raw files
Sv raw pings
TS raw pings
Angle position raw pings
Sv raw pings
Variant 
Sound speed calculation 
Converting time to range for each sample Note: Can use a SoundSpeed profile. 

Calculating wavelength from frequency (subsequently used in power to Sv equation) 

Power to Sv equation. Note: Can use a SoundSpeed profile. 
TS raw pings
Variant 
Sound speed calculation 
Converting time to range for each sample 

Calculating wavelength from frequency (subsequently used in power to TS equation) 
Angle position raw pings
c4 is used for converting time to range for each sample
Ex60: .DG files
Sv (Q telegrams)
Sample Sv (V telegrams)
TS (Q telegrams)
Sample TS (P telegrams)
Single target detections (E telegrams)
Sv from Power (W telegrams)
TS from Power (W telegrams)
Angular position (B telegrams)
Sv (Q telegrams)
With calibration correction
Variant 
Sound speed calculation 
Adjusting the range of each sample 

Adjusting the Sv value of each sample 
With no calibration correction
Not used
Sample Sv (V telegrams)
With calibration correction
Variant 
Sound speed calculation 
Adjusting the range of each sample 

Adjusting the Sv value of each sample 

Calculating sample height (subsequently used to calculate sample range) 
With no calibration correction
c4 is used for calculating sample height (subsequently used to calculate sample range)
TS (Q telegrams)
With calibration correction
Variant 
Sound speed calculation 
Adjusting the range of each sample 

Adjusting the TS value of each sample 
With no calibration correction
Not used
Sample TS (P telegrams)
With calibration correction
Variant 
Sound speed calculation 
Adjusting the range of each sample 

Adjusting the TS value of each sample 

Calculating sample height (subsequently used to calculate sample range) 
With no calibration correction
c4 is used for calculating sample height (subsequently used to calculate sample range)
Single target detections (E telegrams)
With calibration correction
Variant 
Sound speed calculation 
Adjusting the range of each target 

Adjusting the TS value of each target 

Calculating ST thickness 
With no calibration correction
c5 is used for single target thickness calculation
Sv from power (W telegrams)
Variant 
Sound speed calculation 
Sample height calculation (subsequently used to calculate sample range) 
TS from power (W telegrams)
Variant 
Sound speed calculation 
Sample height calculation (subsequently used to calculate sample range) 
Angular position (B telegrams)
c4 is used for calculating sample height (subsequently used to calculate sample range)