Embeds geo location information to the EXIF header of the image file
Support Nikon D90 ONLY
Last Position Memory function, save the last position to internal flash memory, repeat the last position when lost GPS signal. 
Extremely low power consumption: 19mA, it is less than 1/3 of current consumption of GP-1.
Extremely light in weight: 16g 
Extremely small in size
Extremely fast TTFF (Time To First Fix) and fast TTFF at low signal levels.
Extremely high sensitivity (Tracking Sensitivity: -165 dBm), provides superior positioning information in environments, through urban canyons, and under dense foliage.
Ultra high performance MTK MT3339 GPS chip.
66-Channels GPS Receiver for fast acquisition and reacquisition
SBAS, WAAS, EGNOS, MSAS, GAGAN Demodulator
2.5mm jack for remote shutter release
Directly attached to the rectangular 10-pin terminal
NMEA 0183 data protocol
Built-in patch antenna, no external antenna required
Support both RAW (NEF) and JPEG
No Setup Required
 
Specifications
General
Chipset
MTK 3339
Frequency
L1, 1575.42 MHz C/A code 1.023 MHz chip rate
Channels
66 channel all-in-view tracking
Sensitivity
-148dBm (Cold Start), -165 dBm tracking
Position Accuracy (Open Sky)
 
w/o aid
10 meters, 2D RMS
DGPS
SBAS, WAAS, EGNOS, MSAS, GAGAN 5 meters, 2D RMS
Acquisition Time (Open Sky)
 
Reacquisition
Less than 1 sec., average
Hot start
1 sec., average
Warm start
34 sec., average
Cold start
35 sec., average
Dynamic Conditions
 
Altitude:
Maximum 18,000m
Velocity
Maximum 515m/s
Acceleration:
Maximum 4G
Power
 
Voltage
+6V Supply from DSLR Camera
Current
19mA average
Others
 
Interface
Direct attached to accessory terminal
Dimension
53mm*23mm*14mm
Weight
16g
Operating Temperature
-10 to +45 Degrees Celsius
Operating Humidity
5% to 95%, No Condensing
*Some accessories may not be used with Eco ProSumer M at the same time.
*All information and specifications are subject to change without notice.