Yes, the 500€ kit has the gyro within.
Quote: Originally Posted by U-blox website
Features:
Small and lightweight evaluation unit. Ideally suited for laboratory, vehicle and outdoor use
LEA-4R module inside
Built-in Epson gyroscope
No, I didn't buy a kit. They used to supply the older DR module on it's own but I got mine second hand anyway.
Algorithms? Look for Kalman Filter algorithm, That's what u-blox use.