I'm reading the Dec 2015 Golf Digest and on pg. 52 they talk about the 2016 rules changes. Item 7 says "distance-measuring devices that offer prohibited functions such as gauges that factor elevation change or wind speed may be used as long as you don't use the prohibited functions (Appendix IV, Part 5)..." I could only find the 2012-2015 rules on the USGA website so I thought I'd turn here. If this is indeed true $160 Bushnell Pro 1M w/ Slope I got off of Amazon was an even better deal! EDIT: Sorry mods, I just noticed that I should probably post this in the 2016-2019 rules topic. Please close this if you thing this should be posted there. Thanks!