- The WAAS/ EGNOS enabled MR-350PS4 is a "mini" external GPS receiver, which utilizes a bulkhead (7/8" through-hole) style mounting design for applications that require a more permanent weatherproof mounting solution. The enclosed GPS receiver is self-contained with an active patch antenna and utilizes the latest "48" channel SiRF Star IV high performance GPS chipset for accurate positioning. It is also IPX7 water resistant rated.- The extended ' cable allows for easy routing behind the headliner and side panels, terminating into a proprietary pin-out on a PS/2 connector for easy interfacing with either our USB or RS232 cable sets. (sold separately)- The WAAS/ EGNOS enabled by default MR-350PS4 can be used in a wide variety of applications including commercial fleet/utility vehicles, police and fire trucks, boats and specialty equipment, that require great accuracy and durability. For applications that require a only an external GPS antenna without a GPS receiver, please look at our AT-350.