1.can we use little navmap to make a RNP approuch by ourselves.

2.how to draw arc route between two waypoint.(In order to creat acontinious turning) .

8 hours ago, limomo2013 said:

1.can we use little navmap to make a RNP approuch by ourselves.

No. You can use LNM to to draw the approach but you have to reload the scenery library after changing the approach. LNM is not intended to help creating approaches.

9 hours ago, limomo2013 said:

2.how to draw arc route between two waypoint.(In order to creat acontinious turning) .

Creating approaches (procedures in general) is an incredibly complex task. I know this because it was already nightmarish to implement reading, decoding and display.

Regarding the different leg types like "Arc to fix" or "Constant radius arc": I'd suggest to search for words like ARINC 424 and terminator coding. There is also an older a 400 page document for "ARINC 424-17" around the web which might help. The latest ARINC releases cost about 380 $.

Here is information about procedures in LNM: https://www.littlenavmap.org/manuals/littlenavmap/release/latest/en/APPROACHES.html

Alex

If you are using P3D, you can use Airport Design Editor by Scruffyduck to create/modify approaches.

Edited May 7, 20233 yr by pgde

The MSFS developer tools: https://docs.flightsimulator.com/html/Content_Configuration/Environment/Airports_And_Facilities/Approach_Definition_Properties.htm

This applies to X-Plane: https://developer.x-plane.com/article/navdata-in-x-plane-11/#How_do_I_make_my_own_approach_No_hand_editing_please
You can still create your own CIFP files of course but X-Plane CIFP documentation simply links to the ARINC 424 chapter.

Alex