I've kept one for two years and record sunrise/sunset times, moonrise/moonset times, temp, wind speed and direction cloud conditions and which stand i'm hunting. I do very well in the early season, but then have a bad habbit of letting it slide as the year gets past the rut. I need to do better at keeping it going, but also need to do better at using what I have recorded by going back to it for information. So yeah, I do it, but at this point its a useless exercise since I don't take advantage of my own hard work. [>:]
Must improve.