The new compass that points to Jerusalem and "defies" the laws of nature has been exposed as fraud. As Rebel Jew notes, the Observant Astronomer did some research into the compass, marketed by, among others, Torah Educational Software and endorsed by leading rabbis (a.k.a., gedolim) including leading anti-Slifkin agitator Rabbi Moshe Shternbuch. This is what he found:
I have located what is apparently the patent application in question. The inventor is indeed Moshe, but he now apparently lives in New Jersey. It is listed as a "Novelty Item". As one of the anonymous commentators speculated, it is indeed a standard compass with the magnetized needle hidden and another, non-magnetized, needle suspended above it set to point east. At point 14 it points out that similar devices could be made for other locations ". For example, a compass indicating South can be marketed in Finland and Russia," etc. At point 16, it is designed to "appear to defy the laws of physics" by minimizing the space for the magnetized needle.
So, it will only work from one location. It does not point any more accurately to Jerusalem than any other compass. It just saves you having to turn 90 degrees.