Hello again! I'm not so good making intros, so imagine you just read a long and well redacted introduction of why uBlox (the best GPS ever) is so difficult to find and interface with (Specially the SparkFun version). So let's go to the point. ;-)

If you are beginner please don't try to make this.

Fallow this pictures in order to make the wiring (hurry!):

And this is an example of how to connect it to ArduShield, but you must configure the unit first! So continue reading for instructions.

You will need to configure uBlox module using U-center, only have to do it once, the settings will remain in the EEPROM forever. Download U-center from here and install it:

http://www.ublox.com/en/evaluation-kits/u-center/u-center.html

Make sure you supply the unit with 3.3V and interface it using the FTDI cable. When you are able to see real time data with U-center, you are ready to proceed. Click here for a u-Center user guide.

Now UBX has 8 Message Class, we only use "Class 0x01" called "NAV":

Each class has "Messages ID's", we only need 3 ID's of "Class 0x01", the ones marked with blue:

If you need more information about uBlox protocols please download this uBlox_Protocol_Specification.pdf.

Everything else must be disabled. Now that you know what we are trying to do, lets go with a more detailed instructions:

Go to Message View by pressing F9 (menu View->messages view):

(I'm using Paparazzi instructions but modified).

1. Right Click on the NMEA Text on top of the tree and choose disable child messages
2. Choose UBX->CFG->NAV5(Navigation 5) - set it to use Airborne 8 <4G. This tells the Kalman filter to expect significant changes in direction.
Note that this setting is only good for faster moving airplanes. For a fixed position hovering heli, 'pedestrian' setting is better
3. UBX->CFG->PRT - set USART1 to 57600bps
4. Change the baudrate of U-Center to 57600bps if the connection is lost at this point
5. UBX->CFG->RATE(Rates) - change the Measurement Period to 250ms This gives a 4 Hz position update since 4 x 250ms is one second.
6. UBX->CFG->SBAS : Disable (SBAS appears to cause occasional severe altitude calcuation errors)
7. UBX->NAV (not UBX->CFG->NAV): double click on POSLLH, STATUS, VELNED. They should change from grey to black.
8. UBX->CFG->CFG : save current config, click "send" in the lower left corner to permanently save these settings to the receiver.

You are done!! Now plug the GPS to your ArduPilot and fly like a PRO ;-)

[UPDATE:]

Another great way to do it: