The next phase

Sunny Spells is now anchored in the still waters of Phaeton Bay, Tahiti. We motored down here from Pointe Venus this morning in light air, entered the lagoon through Passe Tapuaeraha — threading between sets of surfers catching the long left-handers — and made our way into one of the calmest, most secure anchorages we’ve seen in months. The boat barely moves and it’s a perfect place to pause, reflect, and start building what comes next.

We’re particularly pleased with how well our new cockpit displays performed during the Pacific crossing. The two displays installed either side of the companionway when we were still in the Med ran non-stop for the entire crossing without a single reboot. Conditions were full-on at times — decks wet, wind on the beam, occasional green water over the rail — and the units shrugged it all off. Salt spray, sun, heat, and constant use: no glitches, no drama.

Over the course of 4,000 miles, the displays earned their keep. The high-contrast, legible graphics meant we could easily read them from across the cockpit, even in bright sunlight or in the pitch dark of night watch. The self-dimming brightness was flawless — it always seemed to be just right, whether under the noon sun or a moonless sky.

The interface to our masthead windvane was a noticeable improvement over the old ST60: a smoother and more stable wind angle display, damping was effective without lag, making the readout far easier to steer by.

The touch interface also came into its own. Even when wet with spray, the touchscreen remained responsive. And because we could configure either screen to show any data, we could always get the info we needed at either helm — when had steering we both prefer a heading display straight ahead with the wind on the other display.

I’m convinced these displays will fill a void in the market. My goal for the coming weeks: make it even more useful, more intuitive, and even more like the touch devices we already use every day.

What’s coming:

  • A navigation display with a large heading, a CDI, and SOG, COG, and DTW feeds.
  • A dedicated true wind pointer on the wind instrument screen, so we can see both true and apparent wind at the same time, rather than toggling between them.
  • A UI that does away with the physical buttons. The touchscreen has proven itself — even in rough, wet conditions — so we’re embracing it fully with a swipe-based interface to move between screens (or “apps”), and tap targets on-screen (like units or values) to change them, just like you would on a smartphone.

It’s exciting to be in a place where we can pause and build. Phaeton Bay is quiet, sheltered, and still enough for a floating workshop. Over the next few weeks, while Sunny Spells rests, we’ll be coding, testing, and bringing these new features to life — right here on the water where they belong.

Photos to follow — for now, it’s time for a swim, a stretch, and maybe a glass of something cold. After all, landfall has its perks.

Practical Range for HF Weatherfax Reception

I spent a bit of time rigging a long-wire antenna at home today to see what sort of range is practical for HF Weatherfax reception:

  • The antenna is now about 20 metres long, made entirely from inexpensive hookup wire.
  • The antenna is L-shaped, with one leg oriented East-West and the other North-South.
  • I’ve also connected an earth wire to a copper stake just outside my window, significantly reducing background noise.

To my delight the little Degen DE-1103 receiver pulled in the Wellington MetService broadcast on two of the four frequencies! That’s 1,000 nautical miles! Local weatherfaxes from Charleville (WMC) are now clean and crisp.

HF Weatherfax received in Sydney from Wellington

HF Weather Fax Reception

It hasn’t been really necessary on my last trip, being mostly within range of VHF weather forecasts, but getting offshore weather via HF WeatherFax has intrigued me.

If you’re carrying a notebook computer anyway, the only thing you need is an HF receiver with SSB (Single-Side Band) capability. Most people think megabucks when they hear “HF” and “SSB”, but a very inexpensive receiver will actually do the job. I bought a Degen DE1103 off E-Bay. You simply connect the output from the receiver to your notebook’s microphone input and then use one of the available software packages to decode the fax data received on the appropriate frequency at the given time! I use SEATTY from DXsoft, an amazing piece of software that literally does everything for you!

Receiving a fax using SEATTY

I was amazed at the ability of the little Degen DE1103 receiver (read some reviews here). Even at home, with the supplied 12 metre long wire antenna strung among trees, I can usually get quite clear fax reception. Out at Curlew Island one night, I strung the wire antenna from the forestay to the backstay, and found the receiver was overloaded with the sensitivity switched to “DX”. On “LO” I had perfect reception!

HF Weatherfax received with Degen DE1103 receiver and notebook running SeaTTY

VHF Interference from Autopilot

I noticed in the web log stats that someone had searched for “VHF interference tiller pilot”. This reminded me that I had a problem which occurred soon after the new electrical panel was wired: whenever I turned on the autopilot, there was a constant buzzing interference audible on all VHF channels.

The source was as I had expected: an earthing problem. I used the Seatalk cable to connect to a NMEA multiplexer and the NMEA input to connect to my chartplotter, both of which were earthed, but the primary power input negative (earth) was not connected (d’oh!). The resulting high currents on the signal earths for Seatalk and NMEA caused RFI which was picked up by the VHF antenna.

Many years ago I built an audio (hi-fi) amplifier which had earth loops because of multiple return paths to earth – the AC mains hum was unbearable! Fortunately I remembered that lesson.

The best strategy is always to run all earths (and power supply grounds) to a single earthing point such as the main negative terminal on your electrical distribution panel.

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