Re: Got my Vectronix Terrapin & compared it t my Swaro
Two questions:
First, does the Terrapin calculate the line-of-sight distance to the target or the horizontal distance? I've seen different people say different things about this.
MikeP states the Terrapin calculates only line-of-sight distance.
https://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=3032444#Post3032444
Sendero_man states the Terrapin provides a "corrected distance" to the target based on elevation, which suggests to me that what you are actually getting is the horizontal distance to the target.
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2862671#Post2862671 Perhaps I am just misreading Sendero_man's post?
I note that the Terrapin manual uses the term "slope distance", and there is a brochure from Vectronix for the PLRF 10C (the one with the built-in inclinometer) that appears to define "slope/slant distance" as the line-of-sight distance, as opposed to the horizontal distance:
http://vectronix.ch/userupload/850_PLRF_Brochure_EN.pdf
I would assume that the PLRF 10C is able to calculate horizontal distance based on the the line-of-sight distance, the angle measured by the internal inclinometer, and a cosine function. I can't tell whether the Terrapin has an internal inclinometer, but if it doesn't, I don't know how it would be capable of measuring anything other than the line-of-sight distance. Perhaps someone from PRG could weigh in on this issue?
Second, when ranging a target, does the shooter care more about the horizontal distance or the line-of-sight distance? From a practical standpoint, if the line-of-sight distance to my target is 1000 yards, but the target is at a 30 degree angle above me, the horizontal distance is only going to be about 870 yards. Which distance do I need to plug into my scope?
Thanks for any input folks can provide on these questions.