Replacing Lowrance units at bow and console. Currently have 93sv plus at bow. Planning dedicated livescope GPS map 1222 for bow. Need maps, sonar and side at console and want to be able to network all 3 together. What 12" units can I put at the console that will Network together with the other two. Any additional items I need to buy to make them Network together? Does it have to be a GPS map units or will echo maps work for networking?