Furuno NavNet TZtouch3 Series Operator's Manual page 271

Drag bar to
adjust squelch.
Tap: Switch channel selection mode between
preset and manual.
Long tap: After selecting channel in manual mode,
long tap to register the channel as preset channel.
Select channel.
Example2: VHF, full screen
11. FUSION-Link
Tap to
select
CH16.
Channel
selection
mode
Hide or
show
menu.
Lower volume.
Mute/unmute.
Raise volume.
11-3