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Available Soon - NEW for 2026 ONWA K-Astral MFD chart plotterONWA K-Astral MFD chart plotter, is a professional marine navigation solution for leisure yachts and fishing boats. Available in 8" and 12" versions. New for 2026, this range of 8 and 12” muti-function chart plotters see the introduction of touch screens to the Onwa range of products. The..

AIS aerials/ antennas and AIS. AIS and VHF aerials - what's the difference? AIS (Automatic Identification System) is transmitted on two channels at the top of the Marine VHF band, channel 87B and 88B at 161.975 MHz and 162.025 MHz. An AIS aerial will be tuned to precisely operate on these frequencies whilst a standard marine band VHF aerials will b..

NMEA OneNet - what’s that? NMEA One Net is the new NMEA protocol that Onwa have installed into their latest KM series plotters. It’s an IP (Internet Protocol) system – similar to the way that we send data and information over the ethernet, so it isn’t exactly a brand-new invention but rather a development of one that has been around for a good whil..

If you spot an error anywhere or disagree with anything mentioned on this page we will welcome your comments. AIS - a practical explanation for those unfamiliar. AIS (Automatic Identification System) can be thought of as a VHF radar system using 2 channels in the VHF marine band frequencies (161.975 MHz & 162.025 MHz). Designed as a collision avoid..