|Quoting Haggis79 (Thread starter):
LCH J22 MOL J48 PTW J77 BOS WHALE LOMPI
JAROM NATV 4900N 03000W NATV DINIM NATV
GIPER UN513 GAPLI UM25 INGOR UM25 DVL
This is the route field on a typical flight plan.
There are various things in this field - Click on the links for definitions -
First those 3 letter codes (LCH
) are NAVAIDs
most likely VOR
. These are usually named geographically after the closest city/landmark/points of interest.
Then those 5 letter codes (WHALE/LOMPI/JAROM/DINIM/GIPER/GAPLI/INGOR) are waypoints
. These are defined positions on earth which pilots/computers use to navigate from A to B. These are just points in space. They are named by the ANSP
of their respective countries, sometimes geographically but most often not.
NATV is the code for the North Atlantic Track
- there are several NATs and depending on the wind of the day 5 are picked for use each day by Shanwick and Gander.
4900N 03000W is a latlong (latitude
) - 49deg North 3deg West - roughly off the French coast
. These are points on earth but not given proper waypoint names.
Finally those alphanumeric entries (J22/J48/J77/UN513/UM25) are airways representing long streches of route that links the preceeding/proceeding navaids/waypoints. An airway is made up of many navaids/waypoints. This abbreviates the route to become the segment between the starting/ending waypoints. Saves writing out all those points in between.
All of those above together make up a complete routing from origin to destination, although KIAH (Houston) and LFPG (Paris CDG
) are missing (entered in other fields).
There used to be NIMA/NGA
who collated navaids and waypoints information but since October 2006 they do not publish this information anymore due "national security". So you have to look them up in the AIPs
of the respective countries. They should contain everything incl lists of navaids/waypoints/latlongs. For example you may have to look up the FAA
for the above route.
[Edited 2007-02-11 14:03:26]