The HELIX 10 DI GPS model shares quite many similarities with the HELIX 10 SI GPS model. However, this model comes with dedicated Down Imaging sonar, a transducer specific for this type of sonar technology, and evidently does not have Side Imaging. In terms of sonar, this unit offers both Down Imaging and DualBeam Plus sonar. For Down Imaging, is capable of 455/800 kHz, and … [Read more...] about Humminbird Fish Finder HELIX 10 DI GPS Review