Robert, you may be thinking of Custom Locations for that nude beach - Markers are not saved.
SOM, Anytime you tap the screen it drops a marker that shows the last/lon and your distance & course to the marker. And they have an "Option" button that allows you to get more information regarding stuff near that location. These markers fade away after a few seconds. If you want to pull information about a point several times, you might make it permanent. Or if you want to monitor your distance or course to a point on the map without modifying your flight plan, you could use this.
-Walter