You stated: “We checked the transducers and found nothing on them as far as debrise not sure what to think.”
Is he using more than one transducer with his 898 unit?
If so, how are they connected?
Was there another sonar unit running at the same time?
I have not heard of this before with the routes. Are you sure that these were routes and not tracks? Routes are made from waypoints being joined together (sort of like dot-to-dot) where a track is where the boat has been.
I would watch the videos that Doug Vahrenberg posted on his YouTube account.
http://www.youtube.com/user/imonbass