how to find your lost quad?

If you didnt see where you FPV quad crashed, it can be hard to find, especially when its small!
But as long as you are quick enough so it does not run out of battery, you can usually use the video signal that the model transmits to find it.
Your first measure should always be to record your flights. When you have a recording of the crash, its so much easier to find!
Also a great tool: a directional antenna. Put it onto a regular video receiver or onto a frequency analyser, and you can see in what direction the signal becomes stronger.