Icom's CT-M500 External Interface Box connects to the IC-M510 via wireless LAN to use the NMEA 2000™ interface, hailer function or horn functions.

Features:

• For use with Icom's M510 VHF Marine Transceiver
• Wirelessly connects to provide flexibility on placement
  • If the NMEA connection is on a different part of the boat, the CT-M500 can wirelessly connect with the M510
• Accesses two-way hailer / PA functions with optional SP-36 horn speaker (Sold separately)