Btw / Nxt, Bearing And Angle Deviation Relative Next Course - Furuno FI-303 Operator's Manual

5.6.5

BTW / NXT, Bearing and angle deviation relative next course

To get this function, set NAV = On C14 (See 6.1.4).
This function is using both the Compass and the navigator
information to calculate the angle deviation between the bearing
and the course after tack. i.e. the angle deviation is exactly what
you should expect after the tack.
[BTW] is showing the actual Bering to Waypoint and [NXT] is
showing the negative [-], positive tack or downwind angle that
you would expect if you where tacking or jibing.
You may use COG but our recommendation is to use the
Compass since the response and accuracy is superior. If you
use COG without a differential GPS you will loose too much
accuracy in the information.
[BTW] and [NXT] is toggling.
TACK :
Example: If you expect your drift to be 05 , your tack should be made when you read
[NXT 05 ] to be on (and stay on) lay line.
While you are approaching the proper angle, the value is negative, i.e. -12° and then
increasing to 00° which is on lay line after tack except for the drift which is the margin
you must add to compensate for the drift.
Note! This function is only used on the last leg.
WIND
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