Hello, Guys!

 

Look in this picture given in URL: http://postimage.org/image/m8ow0n52f/

 

Please tell me What are OM and MM? Also by watching image, please tell me is it good approach in given picture?

 

This looks me a very basic question but I request to the Masters to please don't mind it.

 

Regards,

 

AP

http://en.wikipedia.org/wiki/Marker_beacon

I think the wiki article gives a pretty good summary. It might help to think of instrument approaches as a system with sevral components which work together such as:

 

runway pavement markings

approach lighting

markers

heading (such as localizer) and glideslope radio navs

dme radio navs

 

There are other components used by the tower to ensure proper operation such as antenna field monitors and rvr sensors.

 

I think markers came about in approach systems due to the difficulty in determinig distances in aircraft instruments. The marker antenna have a narrow "beam" and so provide a good indication of aircraft distance from the runway threshold. Today with GPS and more widespread use of dme to provide distance information, the markers aren't as needed. Note that dme provides the line of sight distance to the dme transmit antenna, not the "over the ground" distance, that is, it is the slant range.

 

scott s.

.

In regards to the photograph, I think that approach looks fine. Good centering of the localizer and glideslope.

Here is another awesome learning link

 

http://www.navfltsm.addr.com/ils.htm

I'll second that, Manny! One of the best sites on the weeb!!

 

If one needs to know anything about how to navigate in the flightsim world, using real-world techniques - this is the number 1 site. :good: