[Rhodes22-list] More on GPS

[DCLewis1 at aol.com]

Wally,
 
Re PHRF, I’m sure you’re right. To my knowledge you and PT are the boards  
racing resources.
 
I am confused about at least one thing, however.  Your post, and your  recent 
posts, re PHRF indicated it was necessary to declare what sails you were  
using in getting a PHRF - for example you might declare a spinnaker and  that 
factor would go into your PHRF.  However, if you search the web there  are whole 
classes of boats with announced PHRFs, and I’ve found at least  one site that 
will let you compute a PHRF if you know the dimensions of your  boat and it’s 
sail characteristics (I, J) - I assume they are using the standard  sail plan 
for each boat when they make that calculation but I noted there was no  
allowance for spinnakers, asymmetrical spinnakers, etc.  So is PHRF  something a 
committee awards you for a specific race based on what specific  sails you 
declare you will be use for that race, or is it a number that is  derived from the 
basic sail plan for the boat and can be cited, with caution,  for the entire 
class of boats?  Or are there different types of PHRFs;  for example, a club 
PHRF and a class PHRF?  
 
A lot of info on the web gives generic PHRFs - for example there might  be a 
PHRF for a Ranger 23 or O'Day 19 - with no reference to specific  sails.  Are 
they all wrong?
 
Dave



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