Just joined the site, so this is my first post. Just purchased a 899 SI, purchased a 998 at the end of the summer and been waiting to install them at the same time. Question is should I put 2 transducers on the back of the boat and link the units or should I go ahead and install a transducer on the trolling motor. Seems if I mounted 2 transducers on the back of the boat the way the sonar works I would be in good shape at the front of the boat. I have a 20' Charger. Does anyone have an opinion or recommendation on this. Thank you!