Humminbird 981 Fish Finder User Manual


 
Use the illustration to locate the position of the MMC and SD slot cover, remove the
cover, and then insert an MMC and/or an SD card into one or both slots - either slot can
accept either an MMC or an SD card. The label on both types of cards should face down
and away from you so that you’re looking at the back of the card. Press down on
the card until it clicks into place, then replace the slot cover and tighten the screw
snugly - do NOT overtighten, as this will not improve water resistance, and may
damage the cover.
ACCESSORY BUS
Use the Accessory Bus to expand the functionality of
your 900 Series™. Accessories plug directly into the
900 Series™, enabling Advanced features such as
WeatherSense® and the SmartCast® Wireless Sonar
Link. Additional tabs and menu choices will be added
to the menu system automatically when an
accessory is plugged into the unit. In addition,
multiple accessories can be attached simultaneously.
See Accessories Menu Tab and 900 Series™
Accessories in this manual, as well as your accessory
Operations Manual for additional details.
NOTE: Accessories to enable WeatherSense® and the SmartCast® Wireless Sonar Link require
separate purchases. You can visit our website at www.humminbird.com or contact our
Customer Resource Center at 1-800-633-1468 for additional details.
INSTALLATION OVERVIEW
Please read all instructions that are relevant for your configuration before beginning
the installation process.
NOTE: Installation procedures will depend on product configuration.
Accessory Bus
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