Looking for a new one, I don't need maps or even GPS.

Basically I've narrowed it down to 3 specific models.

 

The Garmin striker 7sv, what I like about it is the chirp with down imaging and side imaging it also goes 
up to 800 KHz on the clear vu and down vu.

 

The Humminbird Helix 7 Chirp SI GPS G2, I like everything about this except it does not have  800 KHz but 
it has a 455 kHz: 420-520 kHz.

 

The 3rd is the Humminbird Helix 7 DI, it has a higher frequency (800 KHz) for its down imaging

but it does not have side imaging....I kinda want side imaging.

 

Right now I have a older Humminbird on my boat, so if I did go with Humminbird I would not need to drill new holes in my boat.

Thoughts please.

What is it about 800 kHz that interests you since it has less coverage and less range than 455 kHz?

 

What holes in your boat do you think will match a Helix model?

What is your old Humminbird?

800 KHz will show better detail when closer to the shorelines.

Less range and less coverage but better detail.

 

The Humminbird I think I have is a 500 series, but has the same transducer mount screw holes as the newer

helix series, not 100% sure about the G2 mounts though.

All the 500 series units come the XNT transom mount. Plastic two parts that have impact trip.

That is for the 2D, DI, or SI models.

All new units that have XNT transducers have the exact same transom mount.

Example: XNT 9 20 T is the Dual Beam 2D sonar transom transducer.

 

The included transducer for every model is in the specs for each model on the Humminbird website.