GM-88K is an outstanding high sensitivity Marine GPS receiver. With excellent performance, it's easily to conquer the most difficult tasks. In addition, it also provides various functions to meet customers' needs. GM-88K employs MTK powerful GPS receiver chipset solution. It provides marvelous navigation performance under dynamic conditions in areas with limited sky view like urban canyons. It also has high sensitivity for weak signal operation without compromising accuracy. Undoubtedly, GM-88K is the best choice for you Key Feature: .Excellent noise immunity .Very Fast TTFF .8MBit Flash Memory .Sensitivity: -158dBm(Tracking) .Standard and NMEA-0183 output .User selectable baud rate .WASS,EGNOS, MSAS capable .Easy installation / operation Possible Application: .Marine Navigation. .Fleet Management. .Mileage Management. .Tracking devices/system. .Data logging for marine Navigation. .Mapping devices for PC & Pocket PC. .Marine Navigation or touring devices. .AVL and Location-Based service system. Specifications: Specifications Parameter Description General L1 frequency, C/A code(SPS), 32 Independent tracking channel Sensitivity -158dBm Position Without aid: 3.3m CEP Accuracy Velocity 0.1 Knot RMS steady state Acquisition Cold start 41 sec. (typical) Warm start 35 sec. (typical) Hot start 1 sec. (typical) Reacquisition 100 ms typical (signal reacquisition) Altitude 18000m max. Dynamics Velocity 500 m/sec. Vibration 4G max. Operation Temperature -30°Cto +80°C Storage Temperature -40°Cto +85°C Operating Humidity 0% to 95% RH, non condensing Water Resistance 100% waterproof Primary Power 8V ~ 35V DC Power Consumption 34mA~44mA @ 12V DC Protocol NMEA-0183 v3.01 baud rate(adjustable) 4800/9600/19200/38400/115200, default 4800 Signal level RS-232(standard) Default RMC, GGA, GSV*5, VTG, GSA*5 NMEA Message Optional GLL, ZDA Update rate 1~5Hz ( Default 1 Hz ) EMI filter Rejects power line interference SBAS 1 channel (support WAAS, EGNOS, MSAS) ( Default : disable ) Power cable UL 2464/ 6M Enclosure High impact, corrosion-proof polycarbonate resin Connector Open Cable Dimensions 80mm(Dia.) x 25mm(H) Weight 100 grams (without cable)