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[* black] The two large mesh cylinders make up the ultrasound altimeter, which stabilizes the quadricopter within 6 meters of the ground.
-[* black] The back side of the navigation board contains the Microchip PIC24HJ 16GP304 40MHZ 16-bit microprocessor.
+[* black] The back side of the navigation board contains the [link|http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en530329|Microchip PIC24HJ16GP304] 40MHZ 16-bit microprocessor.
[* black] The gyroscope is also found in this board.