It doesn't matter if ATC say the ship is actually off the end of the other runway... he doesn't have your company performance data, and he doesn't know if the aircraft is in your E/O splay.
A very good point. Why should they know about detailed aircraft performance? This becomes obvious when Emergency Turns (ETs) come into the equation because there is such variation between aircraft types and airlines. We have ETs on some of the runways at BOS (pretty obvious why when you're looking out of the windscreen at the downtown skyscrapers a few miles away...) and I'd bet a fair amount of money that ATC would have no idea what we were up to until we told them.
An obstacle may
look insignificant but supposing a particular ET said "turn 30deg left at end of runway" and that was where a ship was parked?
As mutt would know, most people are very surprised by just how large the E/O area actually is, and how small an obstacle can still cause havoc!
Absolutely. Close-in ones can seem quite innocuous but be more of a real issue than the mountain 20 miles away.