I don't think I've ever played a course that wasn't on my GPS app. I use the Bushnell App and Golflogix and they are usually mapped within a couple months of a new course being open.

I play around 150 rounds on my course a year. Know the course fairly well and all that info is stored in my pea brain plus pretty good at reading greens. They do not change, so no need for a greens book. I use my Bushnell Pro XE with great results. No yardage markers in fairways.

If you subscribe to the decade app and program there is course print outs you can use as well make you play better golf

I tend to lean towards using the GolfLogix App for courses I am not familiar with for yardages and green reading. They also have great books you can purchase if you don't want the app (although that can get costly).

I use a Bushnell gps and it works great for me

Yes I have done those on occasion, especially before an outing when I want to do well and I make a few notes using G**gle Earth beforehand.

I once illustrated all the greens at my old home course, 10or 12 years back. It took me months to get the initial illustrations of all 18 done, but then I continually added to each as time went on as I noticed more nuances and subtleties to each. People marveled at the detail I included.

Being a member, during slow days/times, I would go out onto each green and plot it out using a tape measure and digital level to pinpoint the peaks of each ridge/mogul, various slope percentages and find the low points of the valleys. I would also roll multiple balls in the general area of the various hole locations to see/find some of the non-apparent breaks. I charted everything on each illustration, continually updating them. Each green was full of notes by the time I moved to a different state and a new home course.

For my present club, I just bought a greens-reading app and printed booklet by Greenslopes. Strackaline and Golflogix also offer them. Since I play the course multiple times a week, I rarely use the info. I just know what to expect. In the couple years I've had the booklet, I may have pulled it out of my bag to refer to in an actual round, no more than five times.

Like John T I have used google earth in the past.

Now I use Shot Scope, much easier.

It is okay knowing the greens and the lie of the land but you have to still commit to the shot

It is still down to the playe to hit the right shot at the right time

Sometimes too much knowledge can be a bad thing