Nerd alert: I had to look this up, but it's called an "Eye Reference Indicator". YMMV by manufacturer. They usually look like three little balls arranged in a triangle, although other designs may exist. You set your seat so that your eye sees the front one (white, in the photo) aligned with the back one (orange) on the opposite side, kind of like using a set of iron sights on a pistol. They can help with seat height and track, to put your eye where the cockpit designers intended. Do you have to set your eye precisely there? No, but it's a good place to start if you want some idea of where to adjust your seat. Adjusting to the ERI design point can also help with arm reach and control throw issues, at least if your body falls within reasonable anthro measurements... so lay off the airport food.I'll be honest, if there is one, I am unaware of it. Maybe the P-8 guys can confirm/deny? Though they may have dual HUDs on those things, not sure.
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