[brand1068]

I have the CC3D

What GPS should I purchase is there much difference with the 7 to the 8 ?

Seen this one ..

http://www.ebay.co.uk/itm/Ublox-NEO-7M-GPS-Module-w-Compass-for-APM-Pixhawk-PX4-ArduPilot-FPV-NEO-6M-8M-/252228109159?var=&hash=item3ab9f78367:m:mDPoLbQuyIlNZD0nz0xSomA

Or

http://www.ebay.co.uk/itm/NEO-M8N-M8N-8N-Flight-Controller-GPS-Module-with-Stand-Holder-for-APM-APM2-6-/252240909431?hash=item3ababad477:g:ycUAAOSwI-BWKayp

[f5soh]

For a CC3D board you should only use GPS for telemetry (with Oplink) or OSD data.

Just need a basic GPS neo6 or similar but that can save config because autoconfig is not supported by CC3D.

See here:
https://librepilot.atlassian.net/wiki/display/LPDOC/Configure+a+GPS+for+CC3D
and here:
https://librepilot.atlassian.net/wiki/display/LPDOC/Setup+a+CC3D+for+GPS

[TheOtherCliff]

CC3D GPS setup is a rather painful manual process that is automated in Revo etc.

Those GPS's will very probably work, but you will need to solder a new cable / connector on it to fit the OP connector, and that is just the beginning.  You will need to connect it to your PC with an FTDI (or use ComBridge in your FC) to configure it with the Ublox u-center.exe program.  That configuration is a bit of a pain.

After you go through all that work, what you get is that if you have telemetry, you can watch the GPS trail on the map on the GCS.  That's all.  There is no GPS guidance on CC3D.