Khamelion
Tour Winner
This should be illegal. One of the justifications given for allowing GPS or Laser distance measurement devices is that distance is something that every player can work out without recourse to device measurement i.e. they can pace distance out from yardage makers on or to the side of the fairway. There is absolutely no way that, without a device, I can get a measurement of a slope. So should be banned - if not already banned.
....When back at your home course on the practice green, you can use your phone and an app called 'Clinometer' to find slopes so you can ingrain the feeling.
As ger147 pointed out and as above, use the app when practicing, not when in a comp.
I suppose the final nail in the Aimpoint coffin would be if your handicap went up rather than down after using it........
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Now that would depend, my HC has gone up a couple of points, but that has nowt to do with my putting and more because my overall game is rubbish. Break my game down into driving, approach play and putting, you'd see a small improvement in driving, no change whatsoever in 2nd shot/approach play and a big improvement in putting, but putting them altogether the net result is getting some 0.1 lifts.
I think people are cynical because nobody has been able, as far as I can see, to explain how you assess the slope with your feet, or how you know how much to bend your arm. Nor has anyone been able to demonstrate a link between the adoption of Aimpoint and significant improvement in performance.
The fact that the most famous proponents of the method are, Lydia Ko excepted, pretty honking putters, it's easy to see why cynicism abounds.
The easy answer here is go on the course and find out, but the sceptical are not going to do that.
The other answer is to get a level with a digital read out, or download the clinmometer app, get out on to you home course practice green and use either of the aforementioned items and find a 1%, 2%, 3%, 4% and 5% slope, stand side on to that slope, feet shoulder width apart and feel which foot has the most pressure, that foot is the low side and by using the app or level you will get the feeling of how much slope there is. Some people can feel it better in one foot than the other, for me I got better readings when my left side was on the low side, so if you can't feel on say your left, turn around and face the opposite direction, so that the low side is on the right. Repeat that for the 2, 3 4 and 5 percent slopes.
That's the basics, but if you're one of the sceptics there's not a snowballs chance in hell you'll even attempt any of the above and will remain sceptical and unwilling.