Whether you're a new or an experienced Google Earth user, the following tips will help you get
the most out of the data files presented here.

Google Earth lets you control the transparency of the image overlays in your viewer. In the table of contents on the left, highlight the image layer and adjust the transparency slider as desired.

**IMPORTANT** Google Earth makes intensive use of your machine's graphics card. Image overlays add more of a burden: with older cards you may only be able to view one overlay at a time.

After loading a layer, you'll naturally want to know 'What Am I Looking At?' and 'Where Did the Data Come From?'

Information about each layer can be accessed by clicking on its title in the left-hand table of contents.

Because the files here often link to external websites for addition data (e.g. the well layers), it is more convenient to have that information come up in a separate browser rather than within the Google Earth interface.

To choose this option select 'Tools-->Options-->Preferences' and check 'Show web results in external browser'.

By default, the layer files will open up in Google Earth.
But feel free to download them to your local machine for repeated use. To do this right click on the download link and choose 'Save Target As'. The files can also be sent as email attachments and will open normally in Google Earth when saved to the recipient's machine.