Humminbird
A mention about Humminbird and quality. Humminbird was generally not worth a look while Techsonic was a company. Johnson outdoors (Minn-Kota, Old Towne, Coleman, Bottom Line, Cannon, and many many more) purchased Techsonic and promptly discontinued the Zercom and Fish eye lines to focus on bringing the attention to quality to the Humminbird brand. And may I say they have done remarkably well in this endeavour. as a part of this, they also rolled the Fishin Buddy systems into Humminbird's Product line and otherwise dissolved Bottom Line, formerly a Computroll asset with Cannon Downriggers. The main reason I can give for the lack of support is that Humminbird has never manufactured anything for bottom line and therefore does not have the resources or materials to offer any support. The only place I can recommend is to search for a service center for Bottom Line parts and repair.