The "Export Nav data" has been moved in the newer software versions...
Try this....
Under the “Nav” menu tab in the main tabbed menu system....
Scroll down to the “Waypoints, Routes, Tracks” menu by using the Down Arrow...
Open this menu by using the Right Arrow...
Scroll up to the “Options” submenu by using the Up Arrow...
Open this menu by using the Right Arrow button...
Select the “Select All and…” menu by using the Down Arrow...
Use the Down Arrow to select the “Export” option...
Use the Right Arrow to select “Yes” to answer the question shown on the unit display...
Also (just for info purposes)...
Waypoints can be created on the map while not even on the water....maybe sitting in the garage...
Open any map view...
Zoom out to encompass the area desired to investigate...
Use the 4way cursor to move the crosshair icon to the area of interest...
Zoom in to the desired level..
Using the 4way cursor...manipulate the crosshair icon over humps, underwater points, or other interesting topographical features...
Press the "Mark" button to place a waypoint...
...(pressing "Exit" will return the boat icon to it's original location before it was moved the first time)
Rickie