Marine Electronics

The March 2010 issue of Practical Sailor features letters from readers on such subjects as: household adhesives, Union 36s, foggy electronics, digital freezer controls and converting a boat from gas to electric.

Practical Sailor recently spent a week experimenting with three handheld products geared toward performance sailors. These portable tools are for tracking and improving sailboat speed. Unlike conventional portable GPS units, which have relatively small displays and deliver a wide range of navigational data, these products display large digits that can be read from a distance, and the view options are limited to those that relate exclusively to speed and racing performance. Practical Sailor tested the Speedwatch and two GPS units, Velocitek SC-1 and SpeedPuck. These instruments make good training tools for young sailors and will give all around-the-buoy sailors the ability to quickly quantify performances.

To decide which marine inverter-charger best meets your onboard power demands, first consider how it will used, how and where it will be mounted and what is required to fit with your electrical system. After testing multiple marine inverter-chargers, Practical Sailor offers this report on the units’ inverter capabilities and a follow-up review will report on the units’ charger functions. There are two classes of marine DC inverters: true sine wave (TSW) and modified sine wave (MSW). Each uses a different method to produce AC voltage. Practical Sailor evaluated modified sine wave units from Charles Industries, Magnum Energy, ProMariner, and Tripp Lite, and true sine wave units from Magnum, Mastervolt, ProMariner, and Xantrex.

Practical Sailor found that the full brightness that LEDs offer, coupled with a huge energy savings, a wide tolerance to voltage changes, and a very long expected lifespan, make LED a great alternative to incandescent lights for masthead tri-color. The tradeoff is the considerable heft of the price tag. Practical Sailor tested LED tri-color lanterns from Orca Green Marine (OGM), Signal Mate, and Lopolight. We also evaluated LED tricolor bulbs designed to replace those in the popular Aqua Signal Series 40 tri-color light. Those were bulbs from Lunasea, Dr. LED, and LED Shop.

The February 2010 issue of Practical Sailor has letters on the following topics: requests for more used boat reviews, foggy electronics, hard varnishes, propane fridges and Iphone apps.

In an effort to find an inexpensive, reliable way to connect a PC (or Mac) to our onboard electronic navigation system, Practical Sailor testers scouted basic NMEA 0183 multiplexers with good track records. We zeroed in on the easy-to-install MiniPlex Lite from Holland-based ShipModul. This multiplexer was one of the first high-speed NMEA 0183 multiplexers capable of handling the data rates required for some of the newer electronics like AIS receivers. With very little effort, the Mini Plex Lite allowed us to network our Dell Latitude D620 laptop, AIS, GPS, and chartplotter, and it handled the data transfer without a glitch. Our chief gripe: This entry-level model uses the laptop for its power source.

During our testing of pocket navigators for the December 2009 issue, we examined other approaches to propagating a GPS signal around the boat and found some viable alternatives. Several aftermarket options can turn smart phones or PDAs into handheld navigation tools by supplying or sharing reliable GPS data. Practical Sailor looked at a Bluetooth-enabled Globalsat BT-338 GPS receiver with the SiRFStarIII chipset and Franson Technology’s GPSGate software for Windows and Windows Mobile, which was designed specifically for the task of sharing GPS data. Testers found both utilities to be good choices for the job, however, we still caution against relying solely on a PC-based navigation network onboard.

Practical Sailor’s roundup of practical boater websites covers all topics related to sailing, boat owning, and boat maintaining. From weather forecasting and navigation sites to boat-owners’ groups and social networking sites, these links to online sailing resources are editors’ and readers’ top picks from the world wide web.

Electronics is the most rapidly changing category of marine products, and the steady stream of VHF radios is an example of how fast the market changes. Since our reports on VHF radios earlier this year, two new waterproof handheld VHF radios have entered the market. Practical Sailor compares the new, inexpensive Standard Horizon HX28OS to the 2009 Best Choice, the Cobra HH325VP. Testers compared the new floating handheld from Icom, the M36, to the high-end Best Choice, the Standard Horizon HX85OS, a floating VHF that also offers full DSC capability and has a built-in GPS.

Practical Sailor tests a cross-section of PDAs, pocket PCs, and smart phones between $100 and $800. Palm OS and Windows Mobile software were included. Readability, functionality and practical application were foremost considerations. Reliability, weather resistance, and batteries were also considered. We evaluated Palm Phones Palm Treo, Hewlett Packard iPAQ, Palm PDA Palm TX, Active Captain MobileSource, Memory Map Navigator, and Ozi Explorer CE. Testers compared the mobile devices to a handheld GPS specifically designed for navigation, the Garmin Oregon 400C.