NorthStar MX500 Operator's & Installation Manual page 95

Man Over Board
Selecting Erase Track then pressing the ENT key allows you to clear
your recorded track. You can keep a portion, say the last mile or two,
of your recorded track if you like, by specifying the range after you
highlight the Erase Track softkey and press ENT. Highlight Erase
Now and press ENT to confirm your action. Highlight Escape and
press ENT to return the previous screen without erasing or EDIT to
abort this process.
Selecting Record Track then pressing ENT allows you to define how
your course is saved. Choosing not to save your track may free the
processor up to run other functions a little bit faster; however, you
are not likely to notice any difference in performance unless all data
ports are near their full throughput capacity. You also have three
different levels of track saving capability: Normal, Fine, and De-
tailed. The software saves each calculated position coordinate to draw
the lines for the plot screen. There are a finite number of plot points
which can saved in memory, before the CDU begins overwriting the
first set of plot points. If you are traveling a long distance at a high
rate of speed (say over 10 knots) you probably will want to use the
Normal selection, which only stores a plot point when your direction
changes. If you are doing some tight maneuvering or station keeping
tasks, you will probably want to use the Detailed selection, which
stores a position every 0.5 meters. The Fine selection stores a plot
point every 7 meters.
Version 3.0
Operator's Manual
81