Furuno TZT9 Operator's Manual page 185

9. CAMERA/VIDEO/FUSION-Link
Method 3: Tap two fingers on the screen
Preset [Function Gesture] for [Fusion] (for full window) or [Fusion Ctrl] (for minimized
window) (see section 1.15). Once you have done this preset, simply tap the screen
with two fingers to access the FUSION controls.
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