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Radar Rotation Speed Option Missing
In order for the radar rotation speed option to appear on a chartplotter, dual range must be disabled.
To disable dual range:
From the radar page on current GPSMAP®1 chartplotters, select Options > Radar Setup > Appearance > Dual Range > Off
1Legacy GPSMAP device series menu steps differ from current models, see specific owner's manual for directions. Finding the Owner's Manual for a Garmin Device