1. First, start fresh, removing all displays and data
2. For this exercise we created a "Favorite Bundle" that has the Davenport Radar displays. We'll discuss favorite bundles later. Open this with the Displays→Favorite Bundles→Toolbar→Workshop→Davenport Radar menu item. This should load in the Davenport radar and displays we used earlier.
3. In this exercise we are going to annotate this radar display with the Drawing Control.
4. Create a Drawing Control with either the Displays→Special→Drawing Control menu item or with the toolbar button.
5. Setup the control
   • Choose "Lat/Lon" for the Location.
   • Move the Z Position above the Bottom setting.
   • Select the Draw in current time checkbox.
   • Under the Style tab change the color to something that will stick out, e.g., cyan
   • Change the line width to 6
6. Annotate the radar display
   • Select a cell in the Bow Echo.
   • Circle the cell with a polygon.
   • Step the time animation forward one step. Note: the previous polygon is no longer shown.
   • Circle the cell of interest.
   • Repeat.
7. Now, start the time animation.
8. Stop the time animation and select the Show all button on the Drawing Control

Unidata IDV Workshop for version 6.2u2 > Accessing and Displaying Data > Miscellaneous Displays