There are a few options out there to mounting a fish finder and I chose to go with the Yak Attack Fish Finder Mount with Track Mounted LockNLoad Mounting System. This one is specifically for the Hummingbird Helix series, which will fit the 5, 7 and 9 units. 

It is a very simple install that requires no drilling. All the hardware is included in the kit. Line up the fish finder gimbal mount to the face plate bracket and insert the 4 screws with lock washers and you’re done.  

The lock and load feature is different compared to others. No more ball mounts slipping or rotating when it’s installed on a track. Very easy to use and remove. You can adjust it to your liking. It mounts onto a track system. 

This mount can be purchased at www.yakattack.us/humminbird-helix-fish-finder-mount-with-track-mounted-locknload-mounting-system/