marine

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The little blue and yellow bullet images…

International maritime signal: kilo Small version of the international maritime signal flag for “kilo”, also means “I wish to communicate with you.” With one numeral: “I wish to communicate with you by; 1) Morse signalling by hand-flags or arms; 2) Loud hailer (megaphone); 3) Morse signalling lamp; 4) Sound signals.“.

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Here’s a mystery…

The navigation electronics on Sunny Spells is a mix of Navman and Raymarine equipment. Navman has its own, proprietary communication protocol called ‘NAVBUS’. The Raymarine equipment uses ‘SeaTalk’. On top of this, there is the AIS receiver which transmits data in NMEA0183, but at 38,400bps (bits per second), while most NMEA equipment communicate at the slower data rate of 4,800bps. Sounds like a nightmare to get them all to talk?

Yes and no…

The core of the communications backbone is the Brookhouse multiplexer (MUX) with SeaTalk and AIS options and USB output. When I installed the MUX, I wasn’t expecting immediate success; imagine my delight when the whole system aapeared to work straight out of the box – no modification required!

However, I have started playing around on the chartplotter, and all is not as it seemed…

The data from the wind instrument is not available on the plotter or the Repeat 3100 (both on Navbus). I’m assuming it’s a Seatalk to NMEA conversion issue, but I haven’t been able to investigate as I can’t get the laptop connected. Unfortunately I seem to have mislaid the CD with the USB-Serial driver for the Mux, so I can’t get the laptop connection sorted – aaargh! I’d love to have the wind info on the plotter (which is at the helm) as the crew are forever blocking my view of the wind instrument!

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