I have been using a Nuvi 3579 for several months and I am impressed. BaseCamp routes are not recalculated and the 3579 follows the uploaded route. A selectable side panel shows up coming food, gas, etc. alone the route with distance or view more importation about you route and without loosing your view of the map. Lane assist, touch screen, and route calculation are improved. The is a Garmin iPhone app the lets me search the internet for a POI and send it via blue tooth to the 3579.
My only complaint is the file management system (Finder on the Mac). It sucks just as bad as the Nuvi 1490 LTM. I have to follow the steps below to delete data from the 3579. BC can't delete any previously entered data, unlike my Dakota for which I and use BC to delete geo data.
JaVaWa Device Manager helps with the Trash step but unless I am missing something, there is no way to remove geo data without deleting from the unit and mounting the 3579 and deleting the GPX files.
Can someone help me understand the filing system one the 3579. I was so sure it would be like the Dakota, I did not even check before buying. I am guessing geo data is mixed or stored in a large or hidden file and the unit will not allow or communicate enough to allow a PC application to manage the data. I think the GPX files are backup files.
Thanks
To delete geo data on the 3597,
Deleting Trips/Routes :
GPS disconnected
Touch App
Touch the Trip
Touch the 3 bars upper left corner
Touch Delete Trip
Touch Yes
Deleting waypoints:
GPS disconnected
Touch Where To
Touch Saved
Touch the 3 bars upper left corner
Touch Select All or pick and choose
Touch Delete
Deleting History/Tracks
Touch Settings
Touch Device
Touch Clear Travel History
Touch Yes
Connect GPS to Mac with BaseCamp not running.
Open GPX folder
Drag GPX content to trash
Empty Trash