For info: Hazeltine National GC has the creeks in question (well at least 1 anyway).
On hole 9, around 130 yards in front of the Championship tees on the left is a small pond (just left of the Ladies tee) and this has the F7 option. As previously mentioned this only works if your F6 mode is in one of the 2 new reflective modes. It only toggles between reflective and normal (doesnt include the reflective sky option) so only replicates what can be achieved from the F6 key, so I presume it is really only useful if you are designing a course?
HTH