Links are provided to topographic charts at acme.com and to aerial / satellite images at Flashearth.com.

The topographic charts are USGS 24,000:1 series 7.5 minute quadrangles, with the exception of Alaska at a 63,000:1 scale.

Aerial / satellite images at Flash Earth are available from several datasets, including Microsoft Virtual Earth ("VE") aerial images, Google images, Terraserver (updated daily), etc.... When linking to Flash Earth the radio button labeled "normal" defaults to Microsoft VE aerial images at a magnification level that provides a view roughly 2-3 miles in east-west and 1-2 miles north-south extent. and is denoted by "z = 15" at Flash Earth. The radio button labeled "regional overview" provides a view roughly eight to nine times broader in each dimension (z = 12).

When linking to acme.com these radio buttons provide a 24,000:1 series chart and a 100,000:1 series topographic chart, respectively, for the forty-eight contiguous states.

At Flash Earth one may zoom-in and pan-out to some extent from these default magnifications. Sometimes the Google images are full-color when the Microsoft VE aerial images are black and white. However Google images are often unavailable over the range of magnification provided by the Microsoft VE aerial images - hence the latter was selected as the dataset retrieved upon initial linking to Flash Earth.

With Flash Earth the image center is slighly off-target from the highpoint, having used the (true) highpoint coordinates. However in all cases tested, "normal" magnification will contain the highpoint in the resulting view. This image centering problem renders it inadvisable to have emplaced a third, "high magnification" radio button: the highpoint would commonly be off-map and hence unavailable for inspection.