With a miniature form factor, the GM-305 module manifests EverMore's latest 12-channel GPS technology.

The GM-305 GPS receiver is designed for rapid startup time and high performance in foliage and urban canyon environments. GM-305 applies the latest semiconductor technology so as to provide robust performance.

GM-305 provides enhanced position & velocity filtering for smooth navigation, and onboard patch antenna & RS-232 driver for simple interfacing.

The optional Evaluation Kit makes it easy to evaluate the performance of GM-305. The kit consists of GM-305 housed in translucent case, a Window-based evaluation software, and an operation manual.

• General :L1 (1575.42MHz), C/A code, 12-channel,
  Carrier-Aided with HWTrackc.
• Sensitivity : 165 dBW minimum
• Update Rate :1Hz
• Accuracy :
  Position :25m CEP S/A off
  Velocity :0.1/sec S/A off
  BTime :± 1ms
• Typical Acquisition Time :
  Cold start:< 120sec
  Warm start:< 40 sec
  Hot start:< 10 sec
• Reacquisition :100 millisecond
• Active Antenna (GM-308) :
  >20 dB (100ft)
  >10 dB (10 ft)
• Passive Antenna (GM-308) : > 2 dBic
• Dynamics :
  Altitude : -1000m to + 18,000m
  Velocity : 500m/sec
  Acceleration : ±4g
• Operation Temperature : -40°C to + 85°C
• Storage Temperature : -55°C to + 100°C
• Operating Humidity : 5% to 95%
• Primary Power : 3.8V~8V DC, ±10%
• Power Consumption :
  125mA @ 3.3V
  70-90mA with power saving
• Serial Port : Standard RS-232
• IOs : 1 PPS & TX out @TTL level
• Protocols : EverMore binary mode@4800/9600 baud, 8N1 NMEA-0183 v2.20@4800/9600 baud, 8N1
• Datum : 219 standard datum; WGS-84 (default)
• NMEA Messages : GGA, GSA, GSV, RMC (standard output) GLL and VTG (optional)
• Dimension : 45mmx30mmx13mm w/o housing
• Weight : 25g w/o housing