"Andrew Sarangan" wrote in message
. 158...

I just tried this on DUATs with the route block empty and it
accepted the flight plan. However, it appears to have
automatically inserted the lat/lon co-ordinates of the airport
in the route block. The route is still zero distance.


It's probably not actually zero. Lat/lon coordinates are entered in flight
plans only to the nearest minute, fixes stored in the computer are entered
at a higher accuracy. Using the Route Readout function of ARTCC radar data
processing, which draws out the route on the scope, you can see the little
wiggle caused by a route like ..DDMM/DDMM..VOR.. , where DDMM/DDMM
represents the coordinates of the VOR.