HB uses "DI from SI" technology in the following ...:
*All numbered series SI units ...
*All HELIX G1 series SI units ...
*All HELIX G2 series SI units ...
*HELIX 7 G2N series SI units ...
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HB uses dedicated DI technology in the following ...:
*HELIX G2N MEGA series units ...
*ONIX SI series units ...
*SOLIX SI series units ...
*All DI series units (regardless of generation genealogy) ...
Note: ONIX Sonar series and SOLIX Sonar series can aquire dedicated DI with the optional purchase of the DI xducer for that model ...
Rickie