You may be hunting in a place where the deer only, or almost only, visit at night. Deer don't have to stop by the pond to drink all day.
You might be better to set up on their route back to the bedding area in the morning. Or figure out where they're eating and set up along the route to that in the afternoon. It's not enough to get where deer are. You have to get where they are likely to be at the time of day that you are there.
Also, trying the calling might not be helping. I assume you're trying to draw in a buck. If there's one within earshot and he decides to check you out, he's likely to circle downwind for the approach. In which case, scent becomes a big deal and sitting on the ground is far from ideal. I personally would shy away from calling while on the ground. Deer can small and hear so well that they can pinpoint you too easily and steer clear.