The only G1 HELIXs with CHIRP are the HELIX 12 CHIRP units (HELIX 12 Sonar , HELIX 12 DI, HELIX 12 SI)... all 3 units only CHIRP 2d ...
---
In the HELIX G2 and G2N units ...:
*HELIX Sonar units CHIRP 2d ...
*HELIX DI units CHIRP 2d and DI ...
*HELIX SI units CHIRP 2d, DI and SI ...
Rickie