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You vs. "Them"
Comparing boats on the fly
How well are you doing compared to your competition?
PHRF handicaps are pretty straightforward in timeondistance scoring – if
your boat has a rating 10 points lower than another boat, you give them 10
seconds per mile.
Timeontime scoring is less intuitive than timeondistance. A
boat's rating gets converted to a (nonlinear) correction factor. Each boat's
actual finish time is then
multiplied by its correction factor, and the corrected times are compared to
determine finish places. By this point, the relationship between handicap ratings and
finish places has become pretty convoluted. (See how
to score for an explanation of the formal scoring calculations.)
Seconds per hour
An easy way to handle timeontime is to convert the handicap rating into a
secondsperhour difference between two boats. You can then estimate the
correction easily based on the time sailed. (That's assuming you accurately time
your race, as of course you should.)
The process is a little more complicated for a fleet, because you have to calculate the
secondsperhour difference for each PHRF rating in the fleet, a laborious
process at best. But I've saved you that drudge work. The better approach is to
create a custom table
for your own boat. It's easier than you think.
Using your custom table
How well did you do against "them"?
Look up the correction between your boat and their boat in the table.
 Find your finish time in minutes in the left column
 Find the column for their boat
 The intersection is the "breakeven" difference (in seconds) between the two
boats, given your finish time
 If they sail longer, you beat them
Did you beat them?
For example, you sail the Hestir 30 (rated 102), your competition is the S2 7.9 (rated 171).
You finish in 50 minutes:
 50 minutes in your table yields 317 seconds (5:17) for the S2 7.9
 Add that difference to the time you sailed: 50:00 + 5:17 = 55:17
 That 55:17 is their "breakeven" time
 If they sail longer, you beat them
 Alas, that extra 5:17 is a long time…
Another way to look at it, after you finish they still have 5:17 in which they can still beat you, and you
just can't do a thing about it!
Updated 29 January 2013
