User Manual

35
Sonar Overview
SONAR OVERVIEW (SO
NAR
, DI, SI, CHIRP, MEGA)
A
functioning transducer must be attached to the control head or Ethernet network to enable sonar functions. To purchase accessory
t
ransducers or Ethernet hardware, visit our Web site at humminbird.com.
NOTE: Depth capability is affected by such factors as boat speed, wave action, bottom hardness, water conditions, and transducer
installation. See the Specifications section for details.
DualBeam PLUS Sonar
(XNT 9 20 T)
The DualBeam PLUS sonar beams provide conical coverage directly below the
boat. DualBeam PLUS sonar returns are displayed on the traditional (2D) Sonar
Views. The beams can be blended together, viewed separately, or compared side-
by-side.
The transducer has a narrowly focused 20° center beam, surrounded by a second
beam of 60°, expanding your coverage to an area equal to your depth. In 20 feet
of water, the wider beam covers an area 20 feet wide. The 83/200 kHz transducer
can provide depth coverage up to 1500 feet (500 m).
CHIRP Models:
If your model is also CHIRP-capable, you can operate the beams at
different frequency ranges. CHIRP sonar sends continuous sonar pulses at varying
frequencies to provide more detailed returns and better target separation.
60 Degree Total Coverage
60˚
20˚
200kHz
83kHz
60 Degree Total Coverage
200kHz
60˚
20˚
83kHz