I use the "ruler" to check out how far I have hit a few drives. Or to check out a course that I haven't played before to write out some notes on doglegs (distance to bend), distance to fw bunkers, distance to water hazards, length of water hazards (can I make clear it), and depth of the greens (both yards and feet).
Yes, my daughter (she's a GIS Analyst) showed it to me recently. Of course the first thing I looked for was my local course and it didn't take long to find it. VERY interesting and the cost can't be beat.
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