Well, there could be a number of factors actually at play here. Its possible you werent getting a good satellite fix or possibly that the WAAS error correction wasnt being picked up or used by your GPS unit. Thats one of the features I really like about the Garmin units, they put an accuracy range circle around your boat icon to show the presence and extent of significant fix precision degradation. Lowrance doesnt do that and I havent noticed on Humminbird yet (been too busy enamored with the side imaging ). Also, since lake levels vary greatly on some lakes you have to really pay attention to the existing lake elevation and keep that in mind when looking at the map also knowing what elevation the lake map is based at. So if the lake is 10 high, youll be in 10 of water while the map shows you at the shoreline and vice versa. BUT, some of the lakes on some of the map products, particularly seemingly the Fishing Hot Spots based maps, truly are off. I noticed early in my jaunts to Toledo Bend that Id better not try and drive the boat lanes as marked on the map! They are often 30 or more feet out of the marked lanes and when youre talking a lane that is only 30 wide to begin with then youll find trouble in a hurry that way. I havent noticed that problem on my Navionics maps though, but I havent been looking for it either so they could be better or just as bad. They also use the FHS maps for some of the main lakes that they havent HD scanned themselves yet. Deke[font="]Deke[/font]
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