NorthStar Navigation 961XD Changing GPS speed averaging value, Receiver information screen

SECTION FOUR - Service/Maintenance

Figure 30: Receiver information screen

NOTE:

If you’re viewing and editing information on the RECEIVER INFORMATION screen, and you press one of the five func- tion keys to view other data, the 961 immediately cancels your edit-in-progress so that you can view the data requested by your function keypress. To resume editing at the RECEIVER INFORMATION screen, you must return to that screen and re-enter the data you lost when you pressed the function key. To purposely cancel an edit-in-progress, however, you’d nor- mally press the CANCEL key.

Changing GPS speed averaging value

When you aren’t using DGPS or you’re out of range, you may notice that the SOG readings obtained from the GPS satellite system are slightly erratic, varying by up to several knots. The 961’s GPS SPEED AV function often can improve the steadiness of these readings, although you’ll see a slightly longer display-reaction time when the speed changes.

With GPS speed averaging, you can select the time over which the 961 averages your speed, with available values between one and ten seconds. A longer averaging time is useful at lower speeds when you require the highest accuracy. With this high degree of accuracy, you’ll see a steady display of your speed that’s slow to change. A shorter averaging time, however, provides less accuracy and a quicker-changing display of your speed.

You also can turn off speed averaging completely for the quickest possi- ble display-reaction time.

961 INSTALLATION MANUAL Revision A Page 59