Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Master Navigator Software is a navigation software developed and sold by Sapper Oy. It runs on an ordinary Microsoft Windows PC . For example, a laptop can be used as the vehicle navigator. It uses scanned or downloaded images and orthophotos as the map background. The drawback that a continious internet connection would be required to download information is avoided since the maps are locally stored in the user''s computer. The map is repositioned and new maps are loaded automatically as needed.