I am myself a terrible estimator of the angle by sight. Yes, unless people set ridgelines many are hanging with more sag than they think.
If sleeping through the night is an objective, then one approach to success is sleeping in the same bed, which is to say with the same setup / sag, whatever it is.
Another is Shug's: Hike hard, be very physically tired and quite tolerant of any set up, falling asleep and sleeping soundly.
All joking aside, the thumb and finger method I posted a photo of gets the angle very close to 30*.
Originally Posted by DemostiX
And taking you seriously:
- The eye is pretty good at detecting a 90 degree angle.
- Let's trust that and use a ruler or tape measure instead of a protractor, which few of us have around and can read to 1 degree.
- Get your thumb and forfinger into a 90 degree angle.
- Measure the distance between tip of thumb and tip of forfinger.
- Take a provisional measure of horizontal distance through the forefinger, say, to the middle of the base of the thumb.
- Go to google search or any calculator and put in the ratio of forefinger length to the 'thru-the-air hypotenuse of the triangle. Example 5.25 /6.
- For each .01 difference from .866 you are 1 degree off of 30 degrees sighting a line between tip of thumb and tip of forfinger.
Works for me, thanks. I naturally sight this way a little flat, the ratio being about 0.88. But, I can adjust.