Can somebody explain a eagle tree Basic OSD (FPV)with diagram & the components needed for it.

I just want Altitude & GPS

Also give the links of the products available in hobbyking or any other sellers.

Here is the link to the eagle tree OSD Pro  that is available with us  150 amps version (OSDPRO-PKG-HD4):

http://www.eagletreesystems.com/OSD/OSD-Pro.htm

All the questions are answered by Eagle tree at this link .
The price of the package will be Rs 15000/-

Sai

This might be helpful if you want to build your own
http://www.rcgroups.com/forums/showthread.php?t=921467