HELIX 7 SI GPS ...:

*1 SD Card slot ...
*No preset buttons ...
*Not Ethernet capable ...
*Not RC-1 remote compatible ...
*Navionics +Platinum not supported ...
*Cannot utilize 800kHz imaging frequency of XHS 9 HDSI 180 T upgrade xducer ...
*Not AS GPS HS antenna compatible ... (Well not plug and play anyway - but cut and splice) ...

HELIX 9 SI GPS ...:

*2 SD Card slots ...
*3 preset buttons ...
*Ethernet capable ...
*RC-1 remote compatible ...
*Autochart Live built in ...
*Can utilize 800kHz imaging frequency with XHS 9 HDSI 180 T upgrade xducer ...
*AS GPS HS antenna compatible ...

Rickie