im using fixed broadheads. will they fly the same as my field points or do i have to sight my bow in for my broadheads?

If your bow is tuned properly no they will be right on.

what EXACTALLY is a "tuned" bow? what makes it tuned??

Well there is a lot of truthto what 360 says, A well tuned bow will shoot a broadhead very good. But to say they will all fly like fieldpoints is a bit misleading. You'll need to practice and see which heads fly well for you.

Generally the smaller the diameter of the head the better it will fly, but you sacrifice cutting diameter. So you want to find the middle ground. Is durability important? Price? Replaceable blades? Ease of assembly? There are plenty of great heads out there both fixed and expandable. Have your bow well tuned and find what you like best. Muzzy, G5's, Slicktricks...there is a plethra of good choices available.

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You need to sight your bow with the broadheads before hunting.. Yes a properly tuned bow will typically shoot a broadhead the same.. But type of broadhead has something to do with it also. My brothers bow shoots Nap heads like 6 inches off but shoots Strikers right on the money..

Not to mention that the arrow needs to be tuned as well plus match the bow setup as far as spine, clearance etc.