You can contact Humminbird by completing the online form under the Submit a Request section. If you did not see it on the main page of the Help Center, scroll down until you see the gray panel with a Submit a Request button, or you can click this link.
This form is geared toward providing us with all the information we need to answer your questions on the first reply. The details requested may change depending on the category you select. If the information on the form is requested as mandatory, this means the information is critical to successfully resolving your issue.