I use true north as a reference only. When the wind is coming from the West/Northwest I can mark it on each hole so the "swirls" do not confuse me. Also if you are playing in an area where everything breaks toward the ocean, or Indio, or whatever, I can always have that reference.
For those who play on bermuda, grain is always an issue. The grain will typically grow toward the west (setting sun). Once again having a reference helps to eliminate doubt and is by no means an absolute.
I use the compass exactly the same for wind, Indio, etc.
I use it as a reference for grain, but I prefer to rub the green for a truer test in areas where I anticipate pin placements. I often find grain following slopes and working towards water rather than going to the Southwest. When the slope goes to the Southwest, the grain can become very strong.
I mark the grain in the book as a reference for wedges shots and full shots to help anticipate spin or skip.
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