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SID waypoints

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Can anyone explain why some SID waypoints on PFPX and the FMS database is different from the actuall chart? You get some waypoints like D242H, D346T ?


Vernon Howells

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Those sound like VOR radial/distance waypoints such as D242H could be r242 8d (H=8, T=20 etc).  You can usually decipher the waypoints by reading the procedure's narrative but without a SID reference it's anybody's guess.  More info please.


Dan Downs KCRP

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Ah sorry checkout GOSAM1C EGPH RWY24

 

Its not just that SID, its pretty much all of them.


Vernon Howells

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Can anyone explain why some SID waypoints on PFPX and the FMS database is different from the actuall chart? You get some waypoints like D242H, D346T ?

 

My bet is that they're the non-named waypoints on the procedure. Looks like there are a lot of DME-based non-fixes in there, and the two programs are simply using different terminology to display them. I'm not sure what PFPX uses, but I believe we use the ARINC424 standard.

 

So, D242H would be, as Dan mentioned, radial 242 at 8 DME.

 

See here for more info on ARINC424:

https://www.uasc.com/documents/support/WaypointNamingConventions.pdf


Kyle Rodgers

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Thanks guys! Something new i have learn't today :) but if you look at GOSAM1C SID 242 only goes far as D4.5 ITH not D8 ?


Vernon Howells

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but if you look at GOSAM1C SID 242 only goes far as D4.5 ITH not D8 ?

 

Don't know what to tell you. If you see an error in the nav data, tell the people who make the nav data.


Kyle Rodgers

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