Here is some more information about Navionics partnering with Vexilar to bring sonar and mapping together for Smart Phones and Tablets with a WIFI transducer than can be permanently mounted or made portable to bring from place to place or boat to boat. Check it out:
I will be out on Clear Lake this weekend testing this out, sonar logging and trying out my home made crawdad colored Strike King XDs on the rock piles. Sure wish Strike King would make a craw color. Make sure you update your Navionics Cards so you can get the freshest data.