Average Lap Racing

Good Morning All,
I'm scoring a Multihull event with a single handicap fleet.
The fast boats will do 3 to 4 laps of the course and the slower ones 2 to 3.
I've used the laps on sailwave before and it all works well. But any suggeations of an easy way to implement the adjustment as recommended in the RYA document on Average Lap Racing shown below, or will I have to just do it by hand.
Regards
Dave Vinnell
Galway Bay sailing Club

"When boats with the same PN complete different numbers of laps, those sailing fewer laps may have average times less than those sailing more laps. In such a case the �Same PN Adjustment� shown below should be applied. The adjustment increases proportionally the times of those boats sailing fewer laps.

The same PN Adjustment should be applied if a boat�s corrected time is greater than others with the same PN which have completed fewer laps. The adjustment is applied only to the group of boats with that PN. Boats completing one lap fewer than the leading boat in the group will have their Corrected Times adjusted thus:

Modified Time = Corrected Time x Multiplier

Multiplier = Slowest x (Fastest Laps -1)

About-to-Finish Time x Fastest Laps

where:

Fastest Laps is Actual Laps completed by the fastest boat in the group

Slowest is the Elapsed Time of the slowest boat, in the group, to

complete Fastest Laps

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