Furuno FI-303 Operator's Manual page 26

Down Wind:
When sailing down Wind, the boat can always be sailing at the highest WCV (speed
towards the mark). When [NXT] is [00 ] you should jibe because your drift is not
important.
The functions [BTW] and [NXT] is toggling, but can be locked or unlocked by use of the
SET.
Note! This function is only used on the last leg.
WIND
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