Question about Humminbird 581I Hd Di Sonar/Gps Combo
May require a software update.
register your unit at OnixSeries (this is a link to humminbird)
On your "My humminbird" page you will find free software updates for your particular unit.
download the latest update to an SD card and follow the instructions for the installation process.
Posted on May 13, 2015
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