When the user initiates a Go To function on a previously saved navigational item (Spot-Lock, Waypoint, iTrack) and the Humminbird is connected, the GPS coordinates always come from what is stored in the Humminbird and is sent to the i-Pilot Link for navigation.*

Got this from humminbird website. If i read this correctly, then the terrova will use the gps data from the unit to navigate to the waypoint. If the Waypoint is set by gps at the unit then that must be why I am not sitting on top of what I marked. The structure is gonna be directly beneath the unit and not below the terrova. Sounds like i need a gps puck to go above my transducer.

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