You can also combine it with the Side/Down Imaging sonar or your GPS. You can blend both beams on the screen or observe them separately in the split-screen mode. On the other hand, the 200 kHz beam is angled at 20° and provides more focused results. The 83 kHz beam operates at 60° and offers more coverage but lower accuracy.
#Hummingbird helix mega hypack plus#
When it comes to 2D scanning, the unit features a DualBeam Plus sonar, which utilizes two conical beams that operate at different frequencies. Note that they both operate at 455 kHz and perform best when tasked to analyze underwater structures and reveal potential fish hiding places. The down beam operates at an angle of around 75° while the Si and Di scanning modes use thin fan-shaped beams. The Down Imaging range is just 150ft, which makes this model good for inland freshwater fishing. The maximum depth for the 2D sonar is 1,500ft and 240ft on each side for Si. Speaking of sonar functionality, Humminbird Helix 9 Si GPS features 2D scanning as well as Side and Down Imaging. Apart from the temperature sensor paired with the temperature graph on the control unit, the transducer is also 2D, Si, and Di capable, which means it supports all type of sonar functions provided by the unit. Humminbird Helix 9 Si GPS comes with an XNT 9 Si 180 T transducer, the same model that goes with Helix 5 and 7 Si.
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