R2Sonic incorporated double and quad modes to provide a better distribution of sounding over the seafloor.
When enabled, each ping is slightly repositioned from the previous ping; either twice (double) or four times (quad) to form the swath.
Beam Repositioning Angle = [SectorCoverage / (256-1)] / n.
n = 1 for normal mode
n = 2 for double mode
n = 4 for quad mode