CCP went ahead and changed it to make it "easier to understand". ******* idiots.

Enable your Angular column in your overview, then for your weapon multiply the score by (weapon size)/40,000.

Where weapon size = the old sig resolution = 400 for large guns, 125 for medium guns, and 40 for small (frigate) guns.

So if you have a battleship weapon, divide the "score" by 100, if you have a cruiser weapon, divide by 320, and if you have a frigate weapon, divide by 1000. The result is then directly comparable to the Angular column.

**** you for this change, CCP.

EDIT: To be more clear, your chance to hit is affected by range, angular speed of the target vs. your guns tracking, and size of the target vs. your guns' sig resolution.

- if the target is at optimal or closer, you have 100% as far as range is concerned, reduced to 50% at optimal + falloff, and to 0% at optimal + 2falloff

- if you do the math above, and figure out the "old" tracking score that they've now hidden from the spec sheets of your guns, as long as the target's angular in the overview is smaller than this tracking score, you'll hit 100%, as far as orbit / angular is concerned

- and finally there's a penalty to size; battleship guns are designed to hit battleships at about 80-100%, cruisers at about 30-50%, and frigates at about 5-10% due to size. Cruisers hit battleships at 100% , cruisers at 80-100%, and frigates at 30-50%. And frigates hit everything at 80-100%, as far as the size component.

CCP tried to roll the last two stats into a single composite "score", but now there's no number in the overview to directly compare your guns to, so it's annoying. And they always half-ass new features and never reiterate them, so it's doubly-annoying; they'll never fix it.

Oh, and your "chance to hit" is actually rolled into the damage you do; i.e. you don't see more "you miss", you just hit for less damage.