Echoview provides several distinct algorithms for integrating Sv data. They are as follows:
Algorithm 
Description 

Single beam  Equal sample weight 
This algorithm is available for single beam data only. It makes no correction for varying sample size or ping spacing (varying ping rate or vessel speed). This algorithm does not allow for calculation of Volume_integration and dependent values. 

Multibeam cruise scanning  Equal ping weight 
This algorithm is available for all multibeam data. It makes no correction for varying ping spacing (varying ping rate or vessel speed). This algorithm does not allow for calculation of Volume_integration and dependent values. 

Hmode cruise scanning  Furuno 
This algorithm is available only for Hmode data while cruise scanning. It makes allowance for varying sample size and ping spacing (varying ping rate or vessel speed). Note: Only the beams on the leading face of each Hmode ping are considered during school detection. All beams are considered during integration. This may lead to integration errors. A future release of Echoview will address these concerns. See also About ping modes. 

Vmode cruise scanning  Furuno 
This algorithm is available only for Vmode data while cruise scanning. It makes allowance for varying sample size and ping spacing (varying ping rate or vessel speed). 

Smode cruise scanning  Furuno 
This algorithm is available only for Smode data while cruise scanning. It makes allowance for varying sample size and ping spacing (varying ping rate or vessel speed). 

Hmode instrument scanning  Furuno 
This algorithm is available only for Hmode data while instrument scanning. It makes allowance for varying sample size and ping spacing (nonuniform tilt angle variation). 

Vmode instrument scanning  Furuno 
This algorithm is available only for Vmode data while cruise scanning. It makes allowance for varying sample size and ping spacing (nonuniform bearing angle variation). 

This algorithm is applicable only to a targetlocked Hmode or Vmode variable. It makes allowance for incomplete sampling of a region, by extrapolating the Hmode and Vmode data. This algorithm uses a partially sampled analysis domain and extrapolation used to calculate the final result. As a consequence ping, beam and sample based analysis variables must be interpreted with respect to the actual data as follows:

Note: These algorithm will integrate all of the samples within a specific analysis domain. One or more analysis domains can be integrated at one time. See About integration for further information.
Sv_mean
Volume_integration
About integration
Analysis page of the Scene Properties dialog box