The problem with using Boat Scenario is that the time scale is hard to get right between different tracks. This diagram illustrates that perfectly.

For example, between positions 1 and 2, blue moves almost two boat lengths, whereas yellow moves just a bit more than 1 - meaning that blue is moving twice as fast as yellow, even though yellow is sailing a lower course and should be going significantly faster.

It's something that takes a bit of thought when drawing these scenarios.

Also, the little S curve in blue's track between positions 4 and 5 is unrealistic - unless there was a current going from left to right.

It's easy to make boats do the impossible when creating these diagrams. Getting them right takes some skill - and playing the animation over and over until it looks right.