Re: Centerboard position - keel/centerboard Tartan 37 upwind
We have an Irwin Citation 39 CB, similar to the Tartan, that we race.
Under 10 knots apparent we leave it full up.
We start lowering it as the apparent winds build. By 20 knots apparent it is full down.
I used a Sharpe and marked the line, placing marks at full up, quarter down, half down, three quarter down, and full down. Gives a quick visual reference of where that CB is.