This GPS module with patch antenna gives the best possible position information, allowing for better performance with your simultaneous localization and mapping application, track your robot or a vehicle. With small form factor, makes it perfect for mass-market end products with strict size and cost requirements.  

Ublox NEO-6M GPS Features and Specifications:

Standalone GPS receiver
U-blox NEO-6M GPS module
Build in 18X18mm active GPS antenna
UART TTL socket
Rechargeable battery for Backup
Dimension: 22mmX30mm
Height: 13mm
Weight:12g/14.4g(include cable)
Hole diameter: 3mm