I was watching a WWII documentary about the Dambusters.. https://en.wikipedia.org/wiki/Operation_Chastise Part of this was to fly at 150 feet off the water.. SO, they installed lights to let them now when they were at the correct height! See this.. https://youtu.be/Pd_yI35VsqM?t=696 I installed another laser pointer that is a cross, here https://youtu.be/Pd_yI35VsqM?t=696 SO, when i adjust...
