Derren Roberts asks Mark Crossfield in this Q&A "I've heard you say on your vlogs "150, playing 170 yards" how do you and coach Lockey work this out and am I missing something?
Mark discusses that the more you play in the wind and on hilly golf courses you can learn to gauge the effect it has on the ball. Mark has found his Bushnell Tour X Jolt Laser Rangefinder
has been a massive learning curve. This rangefinder has a slope measuring capability built in and so it changes the distance given accordingly.