Doubts on Films/setup

Hi,

There might be a chace to take some pictures of a boat regatta. I would be
in the boat that leats the fleet. Which film is recommended? The weather
should be a clear sky.

I'll be using a 300 zoom lens, I though on using a ISO 800 film on speed
priority set to 1/1000s. Does anyone have experience that can share.

Thanks in advance.

Gustavo Badauy
Rio de Janeiro, Brazil