Humminbird AS GPS HS Precision GPS Receiver with Heading Sensor,

works

Greatly improved the accuracy on our Helix 9, when we are stopped, the boat stays pointed in the correct direction on the display

works great

Vastly improved the accuracy of my Helix 10 Mega. Great Product.

I mounted this unit on the rear deck and turned on the Humminbird 798 hd si. All I can say is wow....

Makes find location easy.

Plug and play. Works great with helix 9

Increases accuracy to within a few feet of pin points.

This receiver is great for slow speed trolling and other slow speed use. For over 10 mph the receiver that comes with your unit works well.

Great heading sensor and GPS. Helps show position when not moving.