This "fitter" should have given you the definition of terms. Call them and have them send to you.

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Retul Certified Fitter. gebioMized Pressure Mapping http://www.PedPowerPerformLab.com.
Retailer of Wahoo Fitness, Sable Water Optics, Enve Composit, Giro and more.
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http://www.OasisOne-Twelve.com - The ultimate hands free hydration system.
https://www.athlinks.com/athletes/19354499 - results.

Those X/Y coordinates are directly off the fit bike/machine and software, easier to work with the correct tool (an X/Y tool!)

The saddle x/y is relatively easy to proscribe, although the 'center of saddle' measurement point is specific to some Fitters. If we assume same saddle between bikes then ok. Normal SX/SY is taken to the point center of clamp a the rail. Secondary measurement of saddle height and setback is taken from BB.

The pad X/Y is the struggle, especially with the P5 as there is less room for maneuvering. To be more helpful your fitter should do the Cervelo P5 Pad Stack and Reach worksheet, as this prescribes the spacers under the bar etc. If the bike you are borrowing is setup as "Xtra low" and you need the High V, there is great misery in totally dissassembling the front end, hydraulics and installing all the correct bits (assuming borrowed bike owner has them).

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Anne Barnes
ABBikefit, Ltd
FIST/SICI/FIST DOWN DEEP
X/Y Coordinator
abbikefit@gmail.com

Thank you. Your post along with some other online research I figured out all the numbers and what they were measuring.

Hopefully this will get me close enough and a few rides will allow me to tweak as needed for my race.