Nanostate is located in accordance with the current international time-zone conventions. These are constructed according to +/- hours up to 12 hours. This means that at any hour Nano reaches through both poles to cover areas on opposite sides of the globe. The map shows the most recent location.
See Nanostate Protocol Vol.1, Article
3 for more.
See also the Nanostate locator (requires Shockwave plugin).
If you have your security settings on high, or you are in a network environment you may not be able to see the location of Nano. This is because Nano reads your system clock and local timezone. You will need to lower your guard to see the location.