With the markers created in the marker window one can
navigate only by opening the marker edit window and
clicking on the marker. But it is not possible to
define keyboard shortcuts to newly created markers, so
each has a unique number that corresponds to its shortcut.
Now in order to navigate one has to open the marker
window, find the proper marker, click on it and switch
to the editor window.
It could be much easier to just use the keyboard shortcut
for the appropriate marker.