Screen 11 - Visibility Information; Visibility Information - ashtech ZY-12 Information Supplement

Screen 11 - Visibility Information

Screen 11 (Figure 3.46) lets you see the time when each satellite is visible. The
display is fully reliable once the receiver has a complete almanac and a valid
position which can be entered on Scree 4 by the user or be computed. From
cleared memory without an almanac present, it takes about 12 minutes after lock
to get full almanac and display complete information. With an almanac present, it
takes approximately 12 seconds. As with Screen 10, if the receiver has not been
used for some time, the screen displays old almanac information.
Access this screen by one of two methods:
Press [9] and the right arrow twice, or
Press [0] and the left arrow until Screen 11 displays.
This bar graph displays the availability periods of satellites over 24 hours,
showing you 2 to 4 hours before and 20 to 22 hours after the current time. Table
3.26 describes the screen parameters.
Parameters
HORIZONTAL LINES Satellite availability windows shown in ascending order with PRN
GMT:03:25:23
74
Figure 3.46. Screen 11 - Visibility Information
Table 3.26. Visibility Parameters
01 at the bottom and PRN 32 at the top. The start/end times are
accurate to 10 minutes
GMT time
Description
ZY-12 GPS Receiver