Be aware that a lot of the rangefinders need a reflective surface at distances over half their rated distance. So quick ranging a tree at 500 yards may not show a reading.
If you just want distances to fixed objects, have a look at the free app called HuntStand. You can mark your elevated platform and get distances to fixed objects on a satellite image. It is pretty accurate on distances.
It is far more important to be able to hit the target than it is to haggle over who makes a weapon or who pulls a trigger.
— Dwight D. Eisenhower