Only have an 8hp Johnson; can use fish finder at slowest speed, or with
the trolling motor. I feel I'd pass by too fast at higher speed, even
if I could.
BTW, husband has a Piranha 1, which takes 6 or 8 AA batteries, and (for
him) works great. We live on 100 acre lake; connects to 2 others a bit
larger. He fishes from a canoe, too; last 2 years caught several 4#
Walleyes, too, besides Bass.