Humminbird HELIX Series Operation Manual page 45

2D Models
XNT 9 20 T
XNT 9 20
XP 9 20 T
XP 9 20
XTM 9 20 T
XPTH 9 20 T
XPT 9 20 T
XAP 9 20
2D Display
20˚
200kHz
83kHz 83kHz 83kHz
DualBeam Cone Angles
DI Display
45° 45° 45°
800kHz
75° 75° 75°
455kHz
DI Cone Angles
83/200 kHz Transducers
DI Models
XTM 9 WIDE DI 20 T
Select Medium Frequency for deep water (more than 800 feet).
Medium
Medium Frequency can be used for deep returns at high speed. If
(83 kHz)
Medium Frequency is selected, the high frequency beam pings in the
Frequency
background but is not displayed.
High
Select High Frequency for more detail at shallower depths (less than
(200 kHz) 800 feet). If High Frequency is selected, the medium frequency beam
is not available.
Frequency
Select Medium/High Frequency to ensure both beams ping
continuously, so the sonar history is not interrupted if the Sonar
Medium/
View is closed.
High
The returns from both beams are blended by starting with the wide
(83/200 kHz)
beam return, dimming it, and then overlaying it with the narrow
Frequency
beam return. The narrow beam sonar returns will stand out from
the wide beam sonar returns.
455 kHz Select 455 kHz CHIRP for greater bottom coverage in deep water (up
(CHIRP) to 350 feet).
800 kHz
Select 800 kHz CHIRP for shallow water and the sharpest image.
(CHIRP)
45
SI Models
XNT 9 SI 180 T
XTM 9 SI 180 T
XHS 9 HDSI 180 T
XTM 9 HDSI 180 T
XPTH 9 HDSI 180 T
XM 9 20 MSI T
XTM 9 20 MSI T
XPTH 9 20 MSI T
Set up Sonar