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Humminbird's HELIX 7 CHIRP GPS G2 boasts a crisp, widescreen color display with intuitive controls. DualBeam Plus sonar uses a focused center beam and a second 60-degree beam to expand your coverage to an area equal to your depth. SwitchFire lets you take command of how your sonar returns appear with Clear and Max modes. The unit also has GPS. Precision GPS chart-plotting uses built-in UniMap which covers the continental US coastlines, inland lakes and rivers. The microSD Card slot allows for external software use.