Garmin GNX 21 Marine InstrumentGarmin GNX 21 Marine Instrument Marine Instrument with Inverted 4 LCD Large, easy to read white or colour digits on a black background for high visibility in low light or darkness; choose from 7 customisable backlight colours Glass bonded display with anti glare lens avoids fogging Fully customisable user profiles for sail or power boating to display most important marine and vessel data Low power consumption (25 mA) with 350 mW (no backlight) 400 mW
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