Open up the desktop version of Google Earth Pro and navigate to the approximate area where your map belongs. In other words, we are going to tell the computer where this map image belongs on the globe. Now that our map is in the JPEG format, it's time to georeference it. Be sure to deselect the checkbox next to "Progressive." If you don't do this, everything will work until you upload the map onto your GPS, when it suddenly won't show up. First, slide the Quality setting all the way up to 100. Now you should be presented with even more options! But there are some important settings here, don't just click Export again. Give your map a name, then click "Select File Type (By Extension)" near the bottom of the Export window and select JPEG image. Now we'll export the map into the JPEG image format. Then select the area you want to keep and press Enter on your keyboard. In GIMP, this can be done by selecting Tools>Transform Tools>Crop. Now is also a great time to crop your map if it has any boarders or frames you don't want to see when you load it onto your GPS. Spend some time playing around with the resolution until you find a setting that looks good. All of the text and important detail is clear. I'm going to close this and import the PDF map again, this time setting the resolution to 200pixels/in.Īnd it looks great. This may be just fine for your purposes, and that's great. It's okay, but some of the small text is getting hard to read. First I'll try the default resolution of 100 pixels/in and see how that looks. For now, we'll just focus on keeping the map looking good as it's converted into an image. Don't worry about the GPS's image size limit yet, though. The real thing we need to pay attention to here is the resolution. Since a PDF is not an image file, upon opening GIMP prompts me to import the PDF and gives me some options. To do this, I'll be using GIMP, a free open source image editor with functionality similar to Photoshop. My map is a PDF file, so the first thing I'll need to do to get the map onto my GPS is convert it into a JPEG. ![]() Doing this manually can be very frustrating and a lot of work for a large map. ![]() When a map is tiled, it is divided into smaller pieces, or "tiles" which are displayed adjacent to each other, creating a seamless image. ![]() While there is no way to completely get around these limitations, we can use a method called map tiling to upload maps that are larger than these limits and view them in full resolution. It doesn't matter if you have the storage space, any more and they won't load. Depending on your device (details here), you can upload no more than 100 or 500 custom map images or tiles.All map image files must be less than 3 MB. ![]() In other words, fine map details and text will become indistinguishable. in short, any image that contains more than 1048576 pixels) will be displayed at a reduced resolution on your GPS.
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