EB-3531 is a compact, high performance, and low power consumption GPS engine board. It uses SiRF Star III chipset which can track up to 20 satellites at a time and perform fast TTFF in weak signal environments. EB-3531 is suitable for the following applications: 
   Automotive navigation 
   Personal positioning 
   Fleet management 
   Mobile phone navigation 
   Marine navigation

Product Features:
SiRF star III high performance GPS Chipset
Very high sensitivity (Tracking Sensitivity: -159 dBm)
Extremely fast TTFF (Time To First Fix) at low signal level
Two serial ports
4Mb flash
Built-in LNA
Compact size (15mm * 13mm * 2.2mm) suitable for space-sensitive application
One size component, easy to mount on another PCB board
Support NMEA 0183 and SiRF binary protocol