What operating system is your Mac running?

If it's not running Windows you're in for a world of hurt.... NF barely runs on real Windows, I'd hate to try getting it working on an emulator.

My suggestion is to make sure you meet the minimum system requirements - but interestingly I don't think I've ever seen them published....

Are you able to run other programs that are compiled for the Windows OS?

You sell your Mac, build a gaming PC at half the price and live happily ever after.

yeah bootcamp sound right, am sure there was a thread about this recently will see if i can find it.

EDIT:

http://navyfield.com/Community/Forum/View.aspx?num=7304&searchtype=0&pagecount=0&searchvalue=mac&sort=5&category=C01&page1=1

and

http://navyfield.com/Community/Forum/View.aspx?num=10314&searchtype=0&pagecount=0&searchvalue=mac&sort=5&category=C01&page1=1

hope they help.

Hmm.. I got a PPC graphic card or something, no intel or AMD (or am I totally wrong?)
I also heard something of parallel programs or something?

I run navyfield on my computer through bootcamp. Although, I have read into turning Navyfield into a Mac App with a program called wine bottler but I already did bootcamp and am too lazy to try the other way.

http://www.macworld.com/article/1164817/the_best_way_to_run_windows_on_your_mac.html

Well that's the problem, you have a mac and want to play games on it.