through T. Group “A” is visible in the background when you switch to the windows groups. To view each group, simply press the right or left arrow key while the mode menu is showing. Each group shows in the background as you press the arrow keys. When you see the group you want to use, simply press the EXIT key to erase the mode menu.

Special Windows

Although most of the windows used in the AccuMap 12 are self-explana- tory, there are several windows that have special features or can be used in unique ways. The following section describes these windows.

Satellite Information Screen (Group A) This screen shows technical information about the status of the GPS receiver. The receiver has twelve channels. Data for each channel is shown on the display. The channels are num- bered one through 12 on the left side of the screen. Every satellite in the constellation has a number assigned to it, called the PRN. This number shows to the right of the channel. The TRK column shows a "T" if the channel is track- ing the satellite, or a "S" if the receiver is

searching for it. ELV is the elevation of the satellite above the horizon; AZM is the azimuth, or direction of the satellite from your location. SNR is the signal-to-noise ratio. The higher the SNR, the better.

If you look at row one in the satellite info screen above, channel 1 is tracking satellite number 6. The satellite's elevation is 53 degrees above the horizon and it's azimuth is 330 degrees. It's SNR is 37, which is good.

The FIX numbers in the lower left corner of the screen show the quality of fix. If the FIX is 9, then it's the best you can get. A FIX of 1 is the worst.The LOCK shows either 2D (latitude/longitude) or 3D (latitude/longitude plus altitude). The receiver must be locked onto at least four satellites in order to show a 3D fix.

Dual Mapping

The windows feature gives you the capability to have more than one map on the display at one time. For example, group "O" shown at the top of the next page has two half-screen maps, side-by-side. Both of these maps are completely independent of each other. In other words, you can zoom

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Eagle Electronics 12 manual Special Windows, Dual Mapping

12 specifications

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