Brunswick Boston Whaler 21 Guardian Series, Operation & Maintenance Manual

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2-14
Section 2 Boat Operation
Trim Gauge
The trim gauge measures the engine’s angle position
relative to the boat’s transom. The first 15° of move-
ment is the engine’s trim range. The additional
engine movement is referred to as the tilt range.
Engine movement through the tilt range does not reg-
ister on the trim gauge.
The trim gauge displays this value as relative Bow Up
or Bow Down .
It takes specific experience with each boat/engine/pro-
peller combination to identify the best engine trim set-
tings for certain conditions. Remember that either
extreme of the engine trim range is usually inefficient.
Generally, engine trim IN is good for acceleration and
load carrying. Engine trim OUT is good for speed and
fuel efficiency.
Refer to the engine operator’s manual for detailed
information about the engine trim systems.