Hello there friends!
As an expert in both formulas and VBA programming, I'm able to help you with this beautiful project.
In addition, I am a swimmer myself too (open waters swimmer: crossed the Orinoco river three times out of three attempts, with only strong in pool training), so I have an additional motivation for this project!
Let me know more details, so we can have this interesting tool built for you!
Best regards,
JoseLuis