Introduction

Thank you for purchasing an Eagle® AccuMap 12™. With its large LCD screen, easy to use menus, and outstanding performance, we think you’ll be happy with this product for many years.

The AccuMap 12 can be used for fishing, hiking, canoeing, offshore boat- ing, and just about any other ground-based activity. This product also takes IMS SmartMap™, C-MAP™, and Navionics™ cartridges, which show greater detail of land and hydrographic features.

Like most GPS receivers, your AccuMap 12 doesn’t have a compass or any other navigation aid built into it. It relies solely on the signals from the satellites to determine its position. Speed, direction of travel, and distance are all calculated from position information. Therefore, in order for it to determine the direction you’re travelling, you must be moving, and the faster - the better. This is not to say the unit won’t work at walking speeds

-it will. But the faster you travel, the easier it is for the unit to determine your direction.

GPS works from satellites that transmit information to the world at very high frequencies. One disadvantage to this frequency is that it’s “line-of- sight”. In other words, the signals don’t bounce around like your local radio or television. If you don’t have a clear view of the sky, or if you’re inside a metal building, the unit probably won’t be able to pick up the signals from the satellites. This is common among all GPS receivers. We have found that using this product inside a car is usually sufficiently close to the windows and windshield that it works well. However, there is an optional remote antenna bracket and cable (model PA-2) that lets you mount the removable antenna on top of the dash, in case it’s required.

Another factor that influences the GPS’ position and navigation capabili- ties is called selective availability or SA. This is small errors purposefully injected into the transmitted signal from the satellites. The government does this to degrade the system’s accuracy to civilian and foreign users.

Even with SA, GPS is the most accurate navigation system ever invented on such a large scale. The Government’s accuracy specification is 100 meters horizontally and 150 meters vertically 95% of the time. In other words, the position shown on your AccuMap 12 could be up to 100 meters in any direction from your actual position, and the altitude could be plus or minus 150 meters from what’s shown on the screen, 95% of the time.

One way around the S/A problem is to purchase a DGPS receiver and connect it to your AccuMap 12. A DGPS receiver (commonly called a beacon receiver), picks up correction signals broadcast from ground sta

12 specifications

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