If you plan on networking you will need to go with the Helix 9 as the Helix 7 will not be capable of networking. This is a post that Rickie posted awhile back about the two Helix units and I am sure he can tell you even more about them. You may want to wait awhile also as Humminbird is coming out with a new version of Helix's Mega's with even better pictures.
"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"
http://www.crappie.com/crappie/side-down-imaging/342362-humminbird-mega/


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