Patent ID: 7891107
Filing Date: 2011-02-22
Classification: G01C

Abstract:
1. A device for determining the angle of a remote rectilinear object relative to a specific reference line comprising: (a) a panel which is configured to be held in front of a user; (b) said panel including a transparent window which allows a user to see completely through said panel and view a remote rectilinear object located behind said panel; (c) said window having a positioning indicia located thereon; (d) a spatial reference associated with said panel; (e) at least one radial line extending at least partial across said window from said positioning indicia; wherein (f) a user looking through said window can simultaneously see said panel and said remote rectilinear object in order to determine the angle of said remote rectilinear object relative to said specific reference line by aligning said spatial reference in an established manner with respect to said specific reference line with said positioning indicia overlying said rectilinear object, using said at least one radial line.