Humminbird HELIX Series Operation Manual page 46

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SI Cone Angles

XNT 9 DB 74 T

XTH 9 DB 74 P

50/200 kHz Cone Angle

Set up Sonar

Select MEGA CHIRP for the highest resolution, sharpness, and

range (up to 250 ft side to side).

Select 800 kHz CHIRP as an alternative frequency with sharp

returns (up to 250 ft side to side).

Select 455 kHz CHIRP for deep water and overall coverage (up to

800 ft side to side).

50/200 kHz Transducers

Select 50 kHz for deep water (more than 1500 feet). 50 kHz can be

used for deep returns at high speed. If 50 kHz is selected, the 200

kHz beam pings in the background but is not displayed.

Select 200 kHz for faster pinging and shallower water (less than

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