Customizing Markers
If you want to rename a marker you previously created, or add an annotation to it, then you can do so by selecting the marker from the “Markers” tab of the “Markers & Routes” page, then selecting the “Edit Marker” button. You can use this to give markers descriptive or useful nicknames, as well as giving them a longer description using the annotation field.
From this Edit screen, you can also delete a marker if you no longer need it.