From the article:
Last, but certainly not least, there are two apps you may want to consider snapping up if you have an Android-powered tablet: SeekDroid and Locate My Kindle. As you can probably tell from the title, both allow you to geographically locate your Android Table or Kindle. The apps cost between $2 and $5, repsectively, yet can save you $200 for a lost tablet.
Don't apps like these need to have WiFi and GPS turned on at the time of loss?
When I carry my Galaxy Player around, both WiFi and GPS are turned off.