Found this on the web. Can't guarantee its veracity, though
ROUTE
INSERT CRUISING TRUE AIR SPEED for initial or whole cruise as follows:
N (knots) followed by 4 digits (e.g. N0125) (K = kilometres per hour)
Note: there is no provision for statute mph)
INSERT CRUISING LEVEL for initial or whole cruise as follows:
A – Altitude in hundreds of feet (use 3 digits eg A025)
F – Flight Level (use 3 digits eg F055). OR VFR – for uncontrolled VFR flights.
INSERT the ROUTE to be flown as follows: for flights OFF designated routes, list points normally not more than 30 minutes flying time apart and enter DCT (DIRECT) between successive points. Points may be VORs, VRPs, land features or
co-ordinates.
It misses out Bearing/Distance which
is allowed.