Asn
From OpenTom
ASN (Assisted Satellite Navigation)
TomTom have added a feature over the PDA versions as GO supports two horizontal plane sensors to detect movement. When enabled (and can be disabled), and you lose satellite signal, then it will use hardware sensors to detect your speed and direction of travel. This will be ideal for cities like Zurich or Basle where there are a lot of long underground tunnels with junctions in them.
