On some of our early model B777s, I notice that I can only insert a max distance of 511 nm on the FIX page.
It was explained this is due to the software...
Having read Bill Bulfer's "Big Boeing FMC User's Guide", it explains that for specific software e.g Product Improvement Package (PIP), Pegasus, 747-400 or 777, it states 'max is 511 nm. (511.9 divided by 2 equals 256. Computer architecture)'.
Having ''Google searched'' I couldn't find any answers.
...I am still left wondering the reason why 511, as opposed to 999, which is what our B777-300ERs allow.
Can anyone give me any further information or answer?
Old Smokey perhaps....?