Editorial Review

Take care of all your instrument needs with the Magellan Meridian Platinum Global Positioning System receiver. This rugged handheld GPS unit coordinates data from up to 12 satellites to pinpoint your location anywhere on the globe, and it includes a barometer and a three-axis digital compass. The 16 MB database provides details on U.S. cities, interstates, major roads, and airports. The Meridian Platinum's Secure Digital Memory Card slot allows you to slide in a data card to get even more detail, or use a memory card to store waypoints and routes.

The Meridian Platinum is PC compatible and stores up to 500 waypoints and 20 reversible routes with up to 30 legs. It also comes with a quadrifilar helix antenna for optimal satellite signal reception and fast position fixes. WAAS and EGNOS capability adds to the versatility of this receiver, which can be operated in English, French, German, Dutch, Finnish, Spanish, Italian, Portuguese, or Swedish.

See your exact position on the Meridian Platinum's seven navigation screens and vertical profile graphs that show elevations of the route traveled. The oversized grayscale display allows you to easily see location information and comes with a backlight and backlit keypad for use even in dim light. Waterproof rubber armoring and an ergonomic, compact design add to the Meridian Platinum's functionality.

Editorial Review

The Magellan Meridian Color GPS receiver is just as at home navigating the highways and byways in your car as it is tracking through your favorite mountain trails. This top-of-the line GPS device features a preloaded 16 MB map database of North America, which can be augmented by detailed maps from optional CD-ROMs via the Secure Digital memory card slot. It also offers easy-to-read navigation screens, good-sized buttons and a thumb directional pad on the front, and WAAS (Wide Area Augmentation Service) for 3-meter accuracy.

Compared to Magellan's Sportrak line, the Meridian is bulkier both in weight (8.5 ounces with batteries compared to the Sportrak's 6.1 ounces) and overall dimensions--6.5 x 2.9 x 1.2 inches (W x H x D)--making it not quite as pocketable (unless you have cargo pants).

The bright color screen measures 2.2 x 1.75 inches and has a decent 160 x 120 pixel resolution with 16 colors. Compared with the staid monochrome screens of most GPS devices, the icons and mapping detail literally jumps off the screen. We found it to be nicely readable in the car and in most outside conditions, though it wasn't at its best in direct sunlight. As with cell phones in the car, you will have to be wary with your usage. The Meridian Color can be a bit distracting while you're driving as you have to read the screen for turning instructions (though there are audible prompts) rather than hear a voice providing directions (a feature of the Magellan Roadmate).

With a selected map region loaded into the memory (such as from the Mapsend DirectRoute CD-ROM), simply press the Goto button and select either a new or previously loaded waypoint or a point of interest (such as an airport or sports arena) to navigate to via a street route. After a bit of calculating, we were presented with a turn-by-turn journey that we could follow while driving. As we neared each turn, the Meridian Color emitted a set of beeps to warn us (which elevated to an urgent beeping when we were right on top of the turn). We used this to plot a course to Seattle's Space Needle, and it produced acceptable results (though, if you're familiar with the terrain, you may know better shortcuts). If you turn off the Meridian while following a route (say if you take a coffee break), you can return right back to it once you turn the device back on.

Magellan's Meridian series offers Secure Digital (SD) memory card expandability, which is a bonus for adding a large amount of map data (especially for long trips). However, we were disappointed at its placement within the device behind the batteries rather than an external slot. This won't be a problem for most users, but it will be annoying if you've got a number of maps spread across several cards.

We experienced good battery life during our test (Magellan boasts 13 hours of continuous use with 2 AA batteries). If you do plan on using it a lot in your vehicle, we recommend either purchasing the optional cigarette lighter power cable or using NiMH rechargeable batteries (which provide a typically longer battery duration as well as minimized cost in the long run).

Overall, we were pleased with this portable hybrid car/outdoor GPS receiver. The Meridian's color screen definitely helps with quickly viewing details while out hiking or mountain-biking, while the driving navigation features were indeed helpful in unknown locales. However, if you do plan on using your GPS primarily in your car, you should think about moving up to either Magellan's Meridian Color Traveler (which includes a street map CD-ROM, vehicle mounting bracket, and power adapter) or the Magellan Roadmate (with voice instruction). --Agen G.N. Schmitz

Pros:

• Color LCD is very readable--routes and icons pop off the screen
• Controls well laid out, navigation screens are intuitive (especially for new users)
• Optional mapping software is easy to use and transfer

• SD memory card slot not easily accessible
• We recommend a power adapter or NiMH batteries for extended car use

Editorial Review

The Magellan SporTrak Pro is a feature-rich, fun, and easy-to-use GPS receiver designed for the serious navigator. Its rugged, waterproof, and ergonomic design is perfect for the outdoorsperson needing a compact but powerful navigator.

Included in SporTrak Pro is a 9 MB North American basemap of highways, major roads, parks, waterways, marine navaids, buoys, lighthouses, and more. An additional 23 MB of built-in memory is included for downloading detailed maps from Magellan's MapSend line of CD-ROMs. With Wide Area Augmentation System (WAAS) support, the SporTrak offers readings with up to a three-meter accuracy.

The large display, along with a front facing 9-key keypad, makes it easy to use in any environment. SporTrak Pro software includes seven graphic navigation screens, storage for up to 500 waypoints and 20 routes, a best fish and game time calculator, and BackTrack for finding your way home after a long trip into the woods.

The SporTrak Pro runs on two AA batteries for up to 14 hours. It's housed in rubber-armored, impact-resistant plastic that's waterproof and also floats.

The WAAS difference

100 meters: Accuracy of the original GPS system, which was subject to accuracy degradation under the government-imposed Selective Availability (SA) program. 15 meters: Typical GPS position accuracy without SA. 3-5 meters: Typical differential GPS (DGPS) position accuracy. Less than 3 meters: Typical WAAS position accuracy.

WAAS is a system of satellites and ground stations that provide GPS signal corrections, giving you even better position accuracy. How much better? Try an average of up to five times better. A WAAS-capable receiver can give you a position accuracy of better than three meters 95 percent of the time. And you don't have to purchase additional receiving equipment or pay service fees to utilize WAAS.

How it Works
WAAS consists of approximately 25 ground reference stations positioned across the United States that monitor GPS satellite data. Two master stations, located on either coast, collect data from the reference stations and create a GPS correction message. This correction accounts for GPS satellite orbit and clock drift plus signal delays caused by the atmosphere and ionosphere. The corrected differential message is then broadcast through one of two geostationary satellites, or satellites with a fixed position over the equator. The information is compatible with the basic GPS signal structure, which means any WAAS-enabled GPS receiver can read the signal.

Who benefits from WAAS?
Currently, WAAS satellite coverage is only available in North America. There are no ground reference stations in South America, so even though GPS users there can receive WAAS, the signal has not been corrected and thus would not improve the accuracy of their unit. For some users in the U.S., the position of the satellites over the equator makes it difficult to receive the signals when trees or mountains obstruct the view of the horizon. WAAS signal reception is ideal for open land and marine applications. WAAS provides extended coverage both inland and offshore compared to the land-based DGPS (differential GPS) system. Another benefit of WAAS is that it does not require additional receiving equipment, while DGPS does.