FMC will not accept route segments, "Sometimes"

[deltatec 0]

Loading route segent example e.g. H110, NS. System allows. Next flight, identical, try to input H110, get message "Invalid entry". if I enter NS directly it sometimes accepts but will pick up waypoint from somewhere els in the world with a rediculous distance e.g. 8,256 NM. Thsi seems to happen at random, may do several flights ok then problem arises. Thanx, Kevin

[downscc 1,327]

Just a reminder that you need to enter and exit an airway from one of the fixes that define the airway, in this case NS is one of the terminus of the airway. What is interesting is the fix NS is defined in the wpNavRTE file but not the wpNavFIX file... usually any fix in the route definitions is defined in the fix file. Maybe Navigraph has an error... they have a forum for bug reports.