This device indicates a distance that is approximately 10-15 meters below the actual distance to the flag. I've compared it to other devices and it's consistently short.
Explore The Night Skies With The Orion SkyQuest XT8 Classic Dobsonian Telescope
12 Review
Nikon ACULON A211 8248 10x50 Binoculars (Black)
20 Review
Dcorn 7'' Digital Microscope with 1200X Magnification, 12MP Camera, and 32GB π¬ TF Card for Adult Hobbyists: Soldering, Coin Collecting, and More - Windows/Mac Compatible
11 Review
π Nikon ACULON A211 8x42 Binoculars: High Quality Optics for Exceptional Viewing
15 Review