1. Can someone explain how Humminbird does the SI to DI Wide. From what I have read the "Wide" setting results in ~1.5X water column. Is this total coverage i.e. 20' depth of water would equal 35 ft coverage. Is this 17.5 ft of each side of the xducer or 35 ft each side? Or is this the slant range?

2. On a dedicated DI Wide xducer with an angle of 75 degrees with 455kHz it states the coverage is ~1.53X depth of water. Is this the same coverage as the SI to DI "Wide" setting.

Hopefully I have explained my question correctly.