While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
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with the fine crosshair it's still possible to lose the reticule even with a 50-60mm lens- try this if your spotting scope has a reticule- i've done it-there's no point in taking the shot if you have no referance point