This video shows a good example of a Flat Earther beating the globe numbers while taking into account the viewer height and then using a curvature calculator. It is important to do the experiments properly without assuming one can simply use 8 inches per mile when you square the mile which fails to take viewer height into account.

Awesome footage taken on December 17, 2017 by Wide Awake (Please subscribe – he’s one of the best) – https://www.youtube.com/channel/UCkxN0iPWExvmFGvbT-zvL6Q
Earth Curvature Calculator: https://dizzib.github.io/earth/curve-calc/?d0=8.09&h0=6.5&unit=imperial
Coordinates conversion: http://boulter.com/gps/
Brochure with Coordinates (page 4): http://www.hernandocounty.us/parks_rec/BoatingWaterways/brochures/WaterWaysBRO-07.pdf
Distance to the Horizon Calculator: http://www.ringbell.co.uk/info/hdist.htm
Height of Camera: 6.5 feet (probably less than 6 feet)
Bill Watts Tripod: 28 31.135, -82 42.471; Distance = 3.59 miles
Billy Steele South Rack: 28 30.415, -82 46.488; Distance = 7.73 miles
Bayport North Rack: 28 33.895, -82 46.851; Distance = 8.09 miles
Bayport Channel Entrance Light: 28 32.850, -82 42.570; Distance = 3.59 miles
Cutter Rock: 28 30.979, -82 49.934; Distance = 11.05 miles

We also verified the coordinates off of a detailed nautical map. However, the distances were slightly different. I find that interesting as to why the coordinates don’t match perfectly. We decided to use the online brochure coordinates so that everyone could independently verify the information. Regardless, I did plot all of the nautical maps coordinates and found the distances. Here they are:
Bill Watts Tripod (Map): 28 31.220, -82 42.490; Distance = 3.58 miles
Billy Steele South Rack (Map): 28 30.324, -82 46.795; Distance = 8.06 miles
Bayport North Rack (Map): 28 34.032, -82 46.919; Distance = 8.20 miles
Bayport Channel Entrance Light (Map): 28 32.806, -82 42.408; Distance = 3.42 miles
Cutter Rock (Map): 28 30.900, -82 50.000; Distance = 11.12 miles