Northrop Grumman Sperry Marine VisionMaster FT, Руководство пользователя

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Navigation Tools Radar/Chart Radar User Guide
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7. To accept a position fix, click the Accept Fix button. A permanent
fix symbol is created, see the LOP Fixes section below.
8. To delete all LOPs from the system click the Clear button. All LOPs
are removed from the display and the Line Of Position window. A
permanent fix symbol remains on the display after the
Clear button
has been clicked.
Using a LOP Position Sensor
A LOP fix may be used as the active data source
for the position sensor, see Position Values in
Sensor Management.
The LOP Position Sensor displays the Lat/Lon
coordinates of the permanent fix.
If the LOP Position sensor is selected, own ship
is re-positioned so that its CCRP is at the centre
of the permanent fix symbol.
The amount of time that the LOP position sensor will be considered
usable after a fix is set in the configuration tool (default time 300
seconds). Note that LOP position sensor data is dead reckoned
between each fix, and this data will become degraded after a
period of time.