As Scatterwave, but the bonus increases to +4.

Concentration checks (for spellcasting, etc) for people aboard ships and in the water, if required, are made with a +5 bonus.

This spell has no effect on a non-moving body of water. The body of water must be at least 80 feet in one dimension, and at least 5 feet in all dimensions.

Greater Scatterwave counters and dispels both Scattercalm and Greater Scattercalm.