You are correct ... $60 to exchange the XNT 9 DI T for the XTM 9 DI 25 T ...
http://www.humminbird.com/Category/S...ducerExchange/
If you have the DI unit in any of the 800/900/1100/HELIX 9/HELIX 10/HELIX 12 ... You can instead exchange for the XTM 9 WIDE DI 20 T for $0 ...
The smaller HB DI units do not have the capability to transmit the 83kHz/200kHz that the XTM 9 WIDE DI 20 T is tuned for ...
Rickie


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