A reader from Sydney, Australia, wrote to say that he’s happily using a NASA AIS Receiver with a program I hadn’t heard of called Software on Board (SOB) from DigiBoat. I gave it a brief looksee, above and bigger here, and was impressed that SOB comes with a 15 MB C-Map world map that’s detailed enough for large area voyage planning. For actual navigation you need full detail C-Maps on a CD or memory card (which you can buy from DigiBoat, ergo the business model). On the other hand, it doesn’t support other chart types, and I found the interface a little difficult—no standard drop-down menus and oddities like those scroll bars in the data windows (probably related to my particular screen resolution/font setup). It’s totally irrelevant, but I also wonder if SOB is as common a swear in Australia as it was in the house I grew up in?
PS: SOB does require registration and a key to access all features, but it really is free at the moment (it may eventually become shareware).
I’m back in Maine, but unfortunately won’t be able to make the Homecoming ceremony for single-hander Bruce Schwab that starts in Portland today. Bruce just sailed from France to Maine aboard his Open 60 Ocean Planet, which must have seemed like a day sail after two circumnavigations in three years, the second non-stop in 110 days racing the Vendee Globe. I understand that our Governor will declare today “Bruce Schwab Day”—kind of goofy, but wonderful to have this great sport better recognized here in the U.S.A.
I particularly wish I could make Bruce’s “Truly Offshore Seminar” on Sunday, which will include a discussion of electronics and “trouble-shooting and repairs on the run”. I got aboard OP in 2003, after the Around Alone race, and know that Schwab removed the Furuno radar and fixed PC/monitors he had then in favor of a lighter laptop with a Nobeltec PC radar dome. Many people think such a setup unreliable but it apparently held up fine on the grueling Vendee course, though there was a problem with the scanner’s tilt mount mechanics. Bruce’s posts describing how he amazingly got to, and fixed, the mount while underway are here (look around 12/21/04).
Comar has a new SLR100 single frequency AIS listener for £299 suggested UK retail (the SLR200 is £575). Since they now make both single and dual frequency, I asked them about the differences. It turns out that their receiver, unlike Nasa’s, automatically switches channels every minute. “The main reason behind this was that just occasionally we have seen ships with faulty transponders that are only transmitting on one channel, so we wanted to ensure we at least caught those some of the time.” The downside of this approach is that infrequent data—like an anchored ship’s name, sent on one frequency every 6 minutes—might slip by the auto switching for a long time.
I’m also learning that the AIS system allows “competent authorities” to manage frequency use in busy coastal areas (apparently the transponders can be remotely controlled by such authorities). Comar confirmed that “Authorized authorities can command individual or all vessels to shift to another frequency. Both the SLR100 and 200 use synthesized frequency controlled radios so that they can also shift frequency. Although the high seas frequencies for AIS will always be the default, it may be that as more congestion occurs in busy areas channel switching will become more prevalent, Tokyo Bay for instance use 2 local frequencies.” Thank you, Comar, for the information. Seems like the frequency issues are a little more complicated than they first appeared, and I intend to keep on digging.
Nobeltec just announced an InSight Sounder option for its VNS and Admiral charting+++ programs. The company can now supply the soft– and hardware for plotting, radar, AIS, and fishfinding, including a heading sensor and even a wireless display. Nobeltec has also established a relationship with SkyMate, the easy-to-use satellite messaging and monitoring system that I’ve followed with much interest. Their respective programs can now share a PC and sensors nicely, and maybe more (not much on either company’s sites yet). Finally, Nobeltec has slashed the price of its AIS listener (was it the first to offer AIS to yachts?), and is running some new rebate programs. And we can imagine that the lads in the lab are working on more ways to expand the total package.
Yesterday I was tickled to learn that Nasa’s AIS Radar and Engine will be marketed in U.S. under the well known Si-Tex brand (thanks, Pascal). That means U.S. sales and support. It also turns out that the Engine will put up AIS targets on a variety of Si-Tex plotters, like the Color Max below (just a mocked up screen). This AIS listener business is moving fast!
Correspondant Dan is psyched about the growing possibilites of Mac navigation for his 40’ sailboat. The starting point is GPSNavX, which offers a hell of a lot for $50, was extravagantly reviewed by Chuck Husick here, and will soon—according to Dan—support free NOAA ENC vector charts. Possible hardware includes a “Mac Mini, a normal 12-15" monitor for below decks, a sunlight monitor (like certain Big Bay screens sold by Tom MacNeil Electronics) for the helm w/mouse and buttons to control the software on the mini, BSB charts form Maptech, and a Nasa AIS Engine.” He also mentions a Mac compatible USB GPS whose links seem dead, but there are other choices; I like the looks of the USGlobalSat MR-350 cabin top model that can be bought with GPSNavX. Dan closes his description with that favorite Mac brag, “And, best of all: no viruses...” Us PC people are a little jealous about that, and about the Mini, which almost seems designed for a boat.
Seems-to-be-a-trend department: another correspondant, a true Uber Geek, wrote last night describing the elaborate system he’s putting together for a custom 50’+ power cruiser. “The helm support computers will be Mac Minis and the planning software will be GPSNavX, an insane value at $50!!”
One problem with putting together a high power marine WiFi system is the need to use finger-thick low-loss LMR 400 coax—the shorter the better—between the high-gain antenna and the radio. The stuff is hard to run and particularly ungainly when plugged into the dinky connector on a laptop’s PCMCIA card. One solution is a WiFi “Ethernet bridge” which can be installed near the antenna and then connected to the boat’s computer or network router via a slim, no-loss Ethernet cable. GeoSat Solutions has gone the next step by designing a 12v, 250 mW bridge into a waterproof box and packaging it with a 10 dB omni-directional antenna. This is a serious ($1,395) big boat system.
It’s a little confusing but note that one of these bridges—there are inexpensive non-marine versions—can connect to a conventional WiFi router. Thus a boater can use a normal WiFi laptop on board, connecting to shore via two WiFi hops. Here’s an interesting example of such a system installed on a Greenpeace vessel.
In addition to Kees’ report yesterday, Dan sent in a link describing another successful test of the Nasa AIS engine, this time in conjunction with GPSNavX charting software for Mac computers. (Thanks, Dan, and I’ll follow up on your other Mac navigation suggestions soon). PC Maritime's interesting Navmaster Superyacht AIS package (look in the Leisure section) includes the same Nasa engine, which passed the company’s own testing and is reportedly pleasing early users. Superyacht’s AIS display looks like the best I’ve seen to date. Click here for the full screen shot and notice how the vessel is drawn to correct scale and its predicted track, i.e. rate of turn, is shown along with its heading. The user gets to control what data gets shown with the AIS target, plus the sidebar neatly categorizes all possible AIS info. I still want to know if there's a downside to only receiving one AIS channel at a time (I've asked Nasa), but it sure is exciting to see AIS hardware, and software, rapidly becoming affordable for even medium size yachts.
Update: “The same data is sent alternately on both channels so listening on one channel only is not much of a limitation. (It means the unit would 'hear' data every 6 seconds rather than 3 seconds from a vessel travelling at speed.)” — Nasa Marine
I’d never heard of this Nasa AIS “Engine” before, but oddly got two e-mails yesterday that referenced it. It seems almost too good to be true: a simple AIS listener that can feed ship information to a PC’s serial port for a mere $200 (plus cost of VHF antenna). It’s sold by a U.K. firm here, but does not seem to be listed at its manufacturer’s site here. One spec I see that might be a deal breaker is that a user must “Select 161.975 or 162.025 MHZ operation”. I thought AIS devices automatically use both. Please, someone, educate me on these mysteries!
Update: Be sure to read the comment from reader Kees who owns one of these listeners, reports good performance, and terms it an �outstanding no unbelievable value...� Thanks, Kees!
This is the first NMEA 0183 multiplexor I know of that can automatically switch to a back up input for any one of three reasons — “a failure to send any NMEA data, an invalid NMEA sentence checksum, or if the validity flag(s) contained within the NMEA sentence indicate that this data is not valid and should only be used with caution (for GPS and Depth data)”. In other words, you could have 4 GPSs (or, more likely 2 GPSs and 2 sounders) feeding the best available data to, say, a plotter and a PC…no manual backup switches needed. Very slick. Actisense’s site has lots of good information on the NSW-1, and it’s available for 260 pounds from at least one English online retailer (the U.S. distributor is Gem Electronics, 843–394–3565).
I’m back in Maine, but unfortunately won’t be able to make the 
I particularly wish I could make Bruce’s “Truly Offshore Seminar” on Sunday, which will include a discussion of electronics and “trouble-shooting and repairs on the run”. I got aboard OP in 2003, after the Around Alone race, and know that Schwab removed the Furuno radar and fixed PC/monitors he had then in favor of a lighter laptop with a Nobeltec PC radar dome. Many people think such a setup unreliable but it apparently held up fine on the grueling Vendee course, though there was a problem with the scanner’s tilt mount mechanics. Bruce’s posts describing how he amazingly got to, and fixed, the mount while underway are 
Comar
Nobeltec just announced an 
One problem with putting together a high power 
In addition to Kees’ report 
I’d never heard of this Nasa AIS “Engine” before, but oddly got two e-mails yesterday that referenced it. It seems almost too good to be true: a simple AIS listener that can feed ship information to a PC’s serial port for a mere $200 (plus cost of VHF antenna). It’s sold by a U.K. firm 
This is the first NMEA 0183 multiplexor I know of that can automatically switch to a back up input for any one of three reasons — “a failure to send any NMEA data, an invalid NMEA sentence checksum, or if the validity flag(s) contained within the NMEA sentence indicate that this data is not valid and should only be used with caution (for GPS and Depth data)”. In other words, you could have 4 GPSs (or, more likely 2 GPSs and 2 sounders) feeding the best available data to, say, a plotter and a PC…no manual backup switches needed. Very slick. Actisense’s site has lots of good information on the