I'm ready to replace my old Lowrance I-Finder, circa 1990s, with an updated unit. The I-Finder is great for most things and battery life is sufficent. ( XR400, no battery ). However I would like to be able to set-up routes for my daily loops. Also like to exchange routes with others. What can you guys suggest. Cabela's has a Garmin Oregon 450 for $199. and the topo map is another $99. Have read some reports of low screen visibility using batteries. Would this fill my needs or ?