Can be utilized in a variety of applications which require GPS signals to be received and decoded in your Windows laptop or tablet PC, and for Mac users, their Mac Books or Mac Book Pro's. Compatible with most all NMEA compliant third party software, the BR 355 S4 is suitable for use in vehicle, marine and aviation navigation, as well as commercial and municipality applications such as fire trucks Slim profile housing has a IPX7 water resistant rating, and incorporates an active patch antenna for the highest level of GPS accuracy The BR 355 S4 requires either the USB, or Serial RS232/PS2 cable sets to function sold seperately via USB SiRF Star IV 48 Channel All In View Tracking NMEA 0183 WAAS/EGNOS Support 2.08 Diameter X 0.75 Built in Supercap for rapid acquisition Built in GPS Patch antenna Built in roof mount magnet Serial port interface