I have the Navionics Hotmaps premium in the sonar unit on the back of the boat. I will be purchasing a new map so I can see detail on the trolling motor unit as well. The 2008 map is $93.78 and the 2009 map is $139.88, has anyone tried the 2009 or know if it is worth the extra money? Or has someone found another type of map that is just as good or better than the navionics hotmap premium for showing lake and/or river detail? Thanks for any replies.