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Got this as a "backup" for trekking to various campsites and locations using GPS. It has a great form factor, is lightweight, and easy to use/read. Also really like the fact that it can be used in fairly low light situations (mid-dawn/dusk) with the scale if one has decent low light acuity. Having said this, I am still unclear how the orientation of the lens mask is to be set. I set mine vertically to make the scale easier to get focused since the lines (magnetic and E/W declination markers are vertical. However, the eye relief is tight and the lens has a large curvature of field and as such I have often difficulty using both eyes - might be me, I have a heavily dominant left eye. I usually site over the case and keep the scale in view to do bearings. The manual diagram showing the lens view shows NO slit mask which is present in 2 of the three compasses in this product line. A general reference to this very poorly written and one is left to sort of intuitively guess the best way to use this lens/scale system. I DO really like the 1/3 to 1/4 degree accuracy - much finer than most compasses, and why I got it, as I also use this to visually site bearing and direction (azimuth) references for daytime binocular and telescope observing of planets and brighter stars. I also use this for daylight orientation to north for my tracking mounts. I need at least 1 degree to avoid having to randomly hunt during the day, especially when Venus and Mercury are closer to the sun. I use shade for this, but need a good reference at the horizon to pan up to the target. That is awesome with this compass! All in all, I do recommend the unit as it is good value, and very nice to use once one gets through the setting up of the lens system. Mine had small plastic specs in the lens inside, to I blew it out with canned dust off and all is fine now.Read full review
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