SDR dongles based on the Realtek RTL2832U chip and the new R820T2 tuner can work as a SDR AIS receivers. This device is more optimized than common SDR receivers and does not require calibration. OpenPlotter and Navigatrix systems are ready to get SDR AIS signal out of the box.
If you don't have any GPS on board or you want an extra positioning device, this is the cheapest and most effective way. GPS (EEUU) and GLONASS (Russia) system compatible. NMEA output. Low power consumption. Fast fix and high sensitivity. It automatically adapts to any baud rate.
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