I think it is fine to play that way, but only if you are familiar with the course (or have a caddie who is.) But, when you are playing a course for the first time it is really nice to have yardages easily determinable. The Kirby markers are good and probably sufficient for most courses. For those of you not from North America, these are green rubber popup markers set on both sides of the fairway every 25 yards from 250 to 50 yards. They are very unobtrusive, but easy to find.I always have to laugh when I see a 20 handicap who couldn't hit it within 10 yards of the correct distance consistently pace off those two yards to the sprinkler head. If you ever play golf with Ron Read, the USGA's Western Regional Manager, he'll try to get you to go for a bet where you add $1 to the kitty each time you look at a yardage marker. Don't do it, he can't reach any par 4 in 2 so he is usually hitting driver, 3-wood, chip or pitch while you're sitting out there wondering if it is a 5-iron or 6-iron to the green.