Help needed with ARC navigation.

[Avalanche110]

Hello everyone.

 

I am trying to setup ARC stations on the NTTR map.

I have edited the R_NAV_data_Nevada.LUA file as per this excellent video.

 

To my absolute amazement, it worked and I can Use the ARC to navigate.

 

However.....

 

The coordinates are close (within 5-10Nm) , but not totally accurate.

The coordinate system used in the NTTR LUA file, differs from the coordinates given in the mission editor.

 

Example.

 

Co-ordinates in mission editor are

 

LAT N 36-34-20.08

LONG W 116-07-21.77

 

Co-ordinates in the LUA file are

 

{ -- 3: COORDINATE_ZONE_04

country = 'USA - Nevada',

freq = 275.0,

lat = 36.34200,

long = 116.072177 * long_modifier,

location = 'unknown',

code = '.- --.. -.-. ' --/N/ AZC

 

I believe i'm having issue with the "long modifier" in the longitudinal coordinate.

The "long modifier" is not required for the Caucasus Map.

 

When entering the coordinates for multiple ARC stations, I found I would need to be creative and add a zero here and there to make the coordinates from the ME correspond to the Examples in the LUA file.

 

 

 

I have gone through the LUA for the Caucasus map and found the coordinate system is straight forward. The coordinates can be taken directly from the mission editor and entered into the LUA file.

 

example.

 

country = 'RUS', --3

freq = 662,

lat = 44.78778,

long = 38.79639,

location = 'DK85',

code = '-.. -.- ---.. ..... ' --/N/ DK85_

 

Does anyone know how I can (accurately) convert the coordinates from the ME into the LUA for the NTTR map? What is the "long modifier" and how does it affect the coordinate format?

 

Any feed back would be greatly appreciated.

[Tarres]

Long modifier is for the "West Longuitude", west of Greenwich 0º Meridian.

 

Data are enetered in decimal, in the Options TAB I think that you can choose this coordinate format.

Otherwise you must convert º/'/' to decimal.

[Avalanche110]

Thanks Tarres.

 

So what I have deduced is that the ARC coordinates in the LUA file are in Decimal degrees.

The mission editor provides coordinates in decimal minutes and Decimal seconds.

 

So I have taken the standard degrees, minutes, seconds values and put them into this converter.

http://www.earthpoint.us/convert.aspx

 

then verified the coordinates using google earth before copying them into the LUA file.

 

Thanks for your help Tarres

[Rudel_chw]

...

So I have taken the standard degrees, minutes, seconds values and put them into this converter.

http://www.earthpoint.us/convert.aspx

 

then verified the coordinates using google earth before copying them into the LUA file.

 

Looks really useful, can you please share your R_NAV_data_Nevada.LUA file?

Thanks a lot :thumbup: