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SIMRAD, NAIS-400 Class B AIS
SIMRAD, NAIS-400 Class B AIS - Image 2
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SIMRAD, NAIS-400 Class B AIS

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The Simrad NAIS-400 is an older-generation Class B AIS transceiver (send + receive), widely used on yachts and small vessels.

  • AIS Class: Class B transceiver
  • Function: Transmit + Receive AIS data
  • Technology: CSTDMA (time-sharing AIS transmission)
  • Use case: Yachts, fishing boats, small commercial vessels

Technical Specification

📡 AIS / RADIO PERFORMANCE

  • Transmit Power: ~2W (≈33 dBm)
  • Frequency Range: 156.025 – 162.025 MHz
  • Channel Spacing: 25 kHz
  • Modulation:
    • AIS: GMSK (9600 bps)
    • DSC: AFSK (1200 bps)
  • Operation: Dual-channel receive + single transmit

⚡ ELECTRICAL

  • Supply Voltage: 9.6 – 31.2 V DC
  • Average Consumption: ~170 mA @ 12V
  • Peak Consumption: ~2 A

🛰️ GPS

  • GPS Receiver: Integrated (≈50-channel)
  • Provides:
    • Position (LAT/LON)
    • Speed over ground (SOG)
    • Course over ground (COG)

🔌 CONNECTIVITY

  • NMEA 2000 (LEN=1)
  • NMEA 0183: 4800 / 38400 baud
  • USB interface
  • Compatible with:
    • Simrad NSS / NSE / NSO chartplotters
    • Simrad RS VHF radios

📐 PHYSICAL

  • Dimensions: 140 × 100 × 42 mm
  • Weight: ~250 g
  • Design: Black-box (no display)

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