B&G Deckman - Manual (Page 55)

Chapter 3: Navigation
3.28
Display options
The following affect only the look of the Navigation window:
Vector scale adjusts the length of the wind vectors
Vector gap sets the gap between the tufts of wind vectors so
that you can see them more clearly.
If your boat does not appear to be in the right position on the chart,
entering a GPS offset here (in minutes and decimal minutes) should
help. A positive value will offset North or East; negative moves position
South or West.
Grid layer spacing allows you to set the distance between lines on an
overlaid grid. Grid layer type gives you the following options:
great circles a great circle is drawn from your present
position to the mark, along with lines parallel
and perpendicular to this in great circle
terms.
Latitude circles grid lines follow latitude in one direction,
with equidistant points along these connected
in the other direction
Display time
Choosing menu>view>display time allows you to set the track time,
e.g. if set to 15 minutes the boat's track (and associated information) is
displayed for the previous 15 minutes.
General Layers
Choosing menu>layers>general allows you to determine what
information is displayed on the screen. Any of the following can be
selected:
mark laylines shows the laylines from the selected mark
boat laylines displays the yacht's present laylines varying