How to go to a USNG coordinate on a map

The only map that I found which is able to center on an entered USNG coordinate is this one:
http://esri-flex.s3.amazonaws.com/flexviewer/index.html

Once there, you have to click:   Tools > US National Grid

and then you will be able to enter the USNG coordinates. That ESRI map tool however  lacks topographic overlays, which is really a drawback.