If you are scanning waters that are shallower than 6 ft (1.8m), Deeper CHIRP+ will automatically enable the Narrow CHIRP beam (675 kHz). This beam will give you the most accurate data at such shallow depths, compared to other beams.
If you scan waters that are deeper than 6ft (1.8m), you will be able to switch between all 3 beams of Deeper CHIRP.