A device for determining whether one or more objects (O) are below or above a maximum elevation angle, the one or more objects (O) surrounding a user terminal of a non-geostationary satellite communication system, the device comprising: a convex image-reflecting surface having a field of view (FOV) and a principal axis (A), said principal axis (A) passing through a geometric center of the convex image reflecting surface (P) and a center of curvature (C) of the image reflecting surface, and having a principal focus (F); a transparent sighting surface disposed such that, in use, it is positioned between the one or more objects (O) and the convex image-reflecting surface ; and a circular elevation limit marking (32, 32-1, 32-2) formed on or in the transparent sighting surface ; wherein an image of the elevation limit marking (32, 32-1, 32-2), as formed by the convex image-reflecting surface , presents a reflected virtual image (V, V1, V2) behind the convex image-reflecting surface ; wherein the image as presented behind the convex image-reflecting surface, including the image of the one or more objects (O) and the reflected image (V, V1, V2), enables an observer, viewing the transparent sighting surface down the principal axis (A) toward the convex image reflecting surface , to identify when an entire reflected virtual image of each object appears substantially outside of the reflected virtual image of the elevation limit marking, and identify a maximum elevation angle above a horizon of the earth below which all the one or more objects (O) in the field of view of the convex image-reflecting surface must remain, wherein the device is either integrated to a housing of the user terminal adjacent to an antenna of the user terminal or is removably mounted on the housing, and wherein the device and user terminal are adapted to be leveled to the ground. a convex image-reflecting surface having a field of view (FOV) and a principal axis (A), said principal axis (A) passing through a geometric center of the convex image reflecting surface (P) and a center of curvature (C) of the image reflecting surface, and having a principal focus (F); a transparent sighting surface disposed such that, in use, it is positioned between the one or more objects (O) and the convex image-reflecting surface ; and a circular elevation limit marking (32, 32-1, 32-2) formed on or in the transparent sighting surface ; wherein an image of the elevation limit marking (32, 32-1, 32-2), as formed by the convex image-reflecting surface , presents a reflected virtual image (V, V1, V2) behind the convex image-reflecting surface ; wherein the image as presented behind the convex image-reflecting surface, including the image of the one or more objects (O) and the reflected image (V, V1, V2), enables an observer, viewing the transparent sighting surface down the principal axis (A) toward the convex image reflecting surface , to identify when an entire reflected virtual image of each object appears substantially outside of the reflected virtual image of the elevation limit marking, and identify a maximum elevation angle above a horizon of the earth below which all the one or more objects (O) in the field of view of the convex image-reflecting surface must remain, wherein the device is either integrated to a housing of the user terminal adjacent to an antenna of the user terminal or is removably mounted on the housing, and wherein the device and user terminal are adapted to be leveled to the ground. <EOS>