B&G Deckman - Manual (Page 39)

Chapter 3: Navigation
3.12
There are three rows of boxes to allow you to control the information
used in the What If? calculations (values in the example in brackets):
C to make Course to make to the mark
Left Distance to the mark (2.40)
Middle Bearing to the mark (255°)
Right Automatic update or fixed (A)
grnd wind Ground wind
Left Ground wind speed (19.4)
Middle Ground wind direction (74°)
Right Automatic update or fixed (A)
current Water current flow
Left Water current speed (1.2)
Middle Water current direction (260)
Right Automatic update or fixed (F)
Click on any box to input a value you wish to try. The right hand
column of boxes read either F or A and show whether the value has been
fixed (F) by your entering a value or is being automatically updated (A)
by the instruments. Initially, all will read A but will switch to F if a
value is entered. Clicking on the A/F box allows you to switch between
your values and those from the instruments.
Note. Any changes made here affect only the What If? function; they do
not affect the Navigation display.
The bottom part of the display contains the calculated leg information
for each tack, or for one tack if it is a free leg:
C to sail Course to Sail: the course to sail for the indicated leg
of the race, allowing for the current. If the leg is not a
free leg then optimum or target values are used to
calculate the courses for each tack or gybe.
Track direction of the track which the boat makes over the
ground if sailed on the above course.