blank map navigation with Qtek G100
May 18, 2006 gps navigation
…Here is how we created a Blank Map. On a (electronic) map of our region with UTM grid, we decided to choose a rather large area of 35 x 45 km, so that we had the possibility to use one map for several different trips. We noted the Eastings and the Northings of the four corners. In Paint Shop Pro we created a new blank image of 1398 x 1798 pixels and added a black border, one pixel large, to all sides of the image. Not sure if this is really important, but this way we had an image of 1400 x 1800 pixels, which is exactly the number of meters, divided by 25, which means that at 100% scale of the map, 1 pixel in the image equals 25 m on the ground. In OziExplorerCE we can zoom in to 1000%. In that case 1 pixel in the image equals 2.5 m on the ground. This is a high enough resolution for GPS use.In order to facilitate the calibration in OziExplorer, we added a symmetric white border of 10 pixels to the image and saved it as a .png file (could also have been a .gif). Now we could geo-reference this image in OziExplorer, using the four corners of the black rectangle on the image as calibration points. Via Img2Ozf we created the .ozfx3 and _ozf.map files and transferred them to the G100…
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