Hi,

I'm working on an RNAV approach for rwy 21 in LLET.

The approach is like this: 7000ft @SAMAR, 3000ft @KITOR, 900ft @MIYAH and then visual for the runway.

I wrote this in the LLET.txt (PMDG\SIDSTAR):

 

APPROACHES

APPROACH RNAV21 FIX SAMAR 7000FIX KITOR 3000 FIX MIYAH 900 RNW 21

ENDAPPROACHES

 

In the FIXES section, I wrote:

FIXES

FIX GODAR LATLON N 29 30.35 E 34 55.86666

FIX HILIT LATLON N 29 28.48333 E 34 54.16666

FIX KITOR LATLON N 29 43.38333 E 34 59.9

FIX LOT LATLON N 29 36.485 E 34 58.56833

FIX RODED LATLON N 29 34.48333 E 34 56.83333

FIX RW03 LATLON N 29 33.29082 E 34 57.39516

FIX SAMAR LATLON N 29 49.33332 E 35 1.06668

FIX SHAKI LATLON N 29 31.66666 E 34 54.38333

FIX YAMAD LATLON N 29 31.43333 E 34 56.38333

FIX MIYAH LATLON N 29 29.60888 E 34 34.98444

ENDFIXES

 

And still, when I add the approach, it shows the waypoint MIYAH 20 nm away, somewhere near Taba, Egypt:

 

The waypoint MIYAH is located, acording to the chart, at:

29°36’32 ” N

034 °59’04 ” E

Which is translated to "N 29 29.60888 E 34 34.98444", as in the FIXES section.

Any help would be very appreciated!

 

Regards,

Liam

liamkosh, on 28 Apr 2013 - 11:41 PM, said:

The waypoint MIYAH is located, acording to the chart, at:

29°36’32 ” N

034 °59’04 ” E

Which is translated to "N 29 29.60888 E 34 34.98444", as in the FIXES section.

Any help would be very appreciated!

It's not translated correctly obviously.

 

correct way to do this: you practically need to transfer from 60 units for one minute (seconds) to 100000 units for one minute (decimal minute).

 

So just take this proportion: 32:60=x:100000 so x=(3200000)/60 x=53333

 

So correct answer would be

29°36’32 ” N equals 29°36.53333'N

 

Same for longitude:

4:60=x:100000 X=400000/60 x=6666

 

So 034°59’04 ” E equals 034°59.06666' E

 

At the end, just make a quick check to make sure calculated number makes sense: 32" is a little over half of minute, and that perfectly match 53333 which is a little over half when you compare with 100000.

 

Btw, when you are converting from low sense to high sense (seconds to decimal minutes), it's ridiculous to go with 10000 units per minute precision. That's just like to try to resize photo from 400x400pix to 20000x20000pix - no quality gain at all. As with decimal system you cannot use base of 60, you can choose between 10, 100, 1000 and so on; base 10 is lower quality (precision) than base 60 so It's perfectly reasonable to go with 100 units per minute.

It's not translated correctly obviously.

 

correct way to do this: you practically need to transfer from 60 units for one minute (seconds) to 100000 units for one minute (decimal minute).

 

So just take this proportion: 32:60=x:100000 so x=(3200000)/60 x=53333

 

So correct answer would be

29°36’32 ” N equals 29°36.53333'N

 

Same for longitude:

4:60=x:100000 X=400000/60 x=6666

 

So 034°59’04 ” E equals 034°59.06666' E

 

At the end, just make a quick check to make sure calculated number makes sense: 32" is a little over half of minute, and that perfectly match 53333 which is a little over half when you compare with 100000.

 

Btw, when you are converting from low sense to high sense (seconds to decimal minutes), it's ridiculous to go with 10000 units per minute precision. That's just like to try to resize photo from 400x400pix to 20000x20000pix - no quality gain at all. It's perfectly reasonable to go with 100 units per minute.

Oh you're right lol. Thank you very much!