Micro MinimOSD Review/Setup and FPV flight test
Here's my review (of sorts) of the Micro MinimOSD, something you can put on your 250 and more usefully use it to mess about with your PID settings.
I like it a lot, despite managing to blow one up (but that's my fault)
Some links from the video -
Here's where you can get the OSD (affiliate link) -
http://www.banggood.com/MICRO-MinimOSD-Minim-OSD-Mini-OSD-W-KV-Team-MOD-For-Naze32-Flight-Controller-p-990556.html?p=E81211714085201408XQ
The excellent MWOSD firmware
http://www.mwosd.com/
...and don't forget the FAQ (I hit two problems that were covered in this, but I ended up in the main docs directory in Github and missed it)
https://github.com/ShikOfTheRa/scarab-osd/blob/master/OTHER/DOCUMENTATION/FAQ.md
Here's Oscar Liang's excellent blog
http://blog.oscarliang.net/
...and this is the link to his document about setting up the micro
http://blog.oscarliang.net/minimosd-micro-setup-naze32-pid-rssi/