How do I know which way prop should spin?

[Debusan]

I have a 2001 Volvo Penta 4.3GL 190 HP SX outdrive. I need to buy new prop but I can either buy RH or LH? Wouldn’t it be standard on which way it turns? I can look at my current prop but who knows if that’s the right on the outdrive.

 

[GA_Boater]

Does the boat go forward in FWD and reverse in REV? Get a new prop with the blades in the same direction.