Frank,
Dutch word is "draai schakelaar 1/12"
Conrad.nl search on it! 3 Euro and on stock.
Use one of the analog ports for these selectors. With 10 differrent resistors you make a ladder and each step will give a analog value.
There are even resistor ladders ready to go.
With the skech you determen which step of the analog selector step is which setting 1 to 10.
If I can assist let me know by PM in Dutch.
Also make an update list which ports and functions of the UNO you currently use.
A switch in the cockpit would be possible but a possible source of error: stressfull times at the start so forgetting to flip it is easy.
Make an optical beam sensor. No driver is no data recording. In case the boat flips and he is thrown out then data recording also stops that is a downside of it. 
Paco