Would love to, but we (or at least I) am going to need a little more information about what you are doing.
CADnoob
There might be some available in autodesks mapping program, but im not sure. : http://www.autodesk.com/products/autocad-map-3d/overview
If you already have you map and you just need the call out location you can create your navaids as a block with attributes.
CADnoob
Can't find what you're looking for? Ask the community or share your knowledge.