I believe the best midrange option on the market is the Raymarine Dragonfly 7.
However, I have recently decided to go with the Vexilar SP300 unit that combines midrange sonar function combined with Navionics app on your tablet and smartphone. This option is ideal for the TI because it allows for multiple screens to be used for both cockpit positions simultaneously via WiFi transmission. Excellent reviews and also very cheap at $199.00. Easy install and excellent battery life with small, lightweight 12V.http://sonarphone.mobi/https://www.youtube.com/watch?v=EpFE-tog-N8
I will post my experience with this setup once I get it rigged up and tried out in a couple months. If anyone has experience with this setup please let us know!
I was looking over this option on the depth finder. The only thing I don't like is the installation, where you going to put that transducer on a TI? How you going to run the cable to the transducer? I like the idea, but I think a thru hull transducer is the way to go, unless that transducer can fit into the lowrence ready kayaks, which I don't have. Also it's only rated for 240ft. Says waterproof IP66, if not (like the Lowrence), it won't work on a kayak over time, expecially in the hull with any water splashing around.
I've got the Navionics boat app on my Samsung III and it works great for GPS and mapping in combination with a waterproof see thru bag and railblaza holder. I'm thinking just a depth finder is all I need, I don't need structure or fish finder. So I'm looking at this Hummingbird waterproof depth finder with thru hull transducer as the best option ($99), rated for 600 ft, after my lowrence locator takes a final dump. http://www.amazon.com/gp/product/B00417 ... G8FGT0Y15F