The degree of slope inhancement chip in the 1500 uses a formula that was created using a suveyors tool called a clinometer (incline meter). The original formula was done in % and as you know the 1500 uses degrees. This is unfortunate, because degrees are not as tight as % (0 to 90, degrees gives you 90 segments, % gives you 100). Also, it is very easy to do the math using % , very difficult using degrees. This may change, there is still talk of bringing out a model using %.
Most of the people on the various Tours who use this concept, (the # is growing every week) use % because, lazers are not allowed for shots in Tour events and being able to do the math quickly is critical. Interestingly enough, Jim Flick was asking about this same issue at the John Deere on Tuesday.
One final point, how tight do you want to be with your numbers; when I do a new course I use reflectors to check yardages because the varience with reflectors is very tight ( plus or minus 1 yd). Just shooting a flag or a bunker, the varience is probably plus or minus 3 and therefore your slope yds will also be affected
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