My philosophy is that if I really put an effort into finding your cache, and can't find it then I will post a DNF, if I'm pressed for time and put a half donkey effort (did I mention that this is a family friendly blog) then I probably won't mark it as a DNF but I will go back and try again when I have time.
I heard from a Cacher the other day that they never mark DNF's as they think it makes them look inept. I tried to explain that it was important to the CO (Cache Owner), if they are getting to many DNF,s then they will check on the cache to make sure it hasn't been Muggled.
Part keeping Geocaching fun is to keep the caches well maintained, if we don't mark our DNF's after an honest try at the find, then how is the CO (Cache Owner) to know when things have gone awry.
What is your opinion on DNF's ?
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NATIONAL GEOCACHER