Boat scouting—figuring out a rapid from in your boat rather than getting out on shore to actually scout—is a highly over-looked, but all important kayaking skill.
Take Ecuador’s Upper Jondachi for example. It’s only 10km long (6 miles) but is jam-packed with rapids. Most of the rapids are boat scoutable for the skilled boat scouter. On average, this run takes groups where no one knows the run 3-5 hours. If you weren’t confident at boat scouting, you would literally be getting out of your boat 70+ times on this run and it would take you days to finish.
It’s a common complaint that people can’t practice boat scouting because they are always running the rivers with someone who knows them well.