Newer devices also make it possible to save different details of the map in different images and then use them simultaneously. The decisive factor is whether they are saved to the Garmin/ĭirectory. Modern devices differ in that they read image files independently of the way they are named. You can create this kind of file via the Mkgmap option -gmapsupp You will need an image file called gmapsupp.imgįor old Garmin compatible devices. The processors for most GPS devices tend to be feeble, something that becomes apparent when trails and routes get loaded. Instead, you should use the memory card in the computer. In order to reduce the copy time required for larger and larger files, it is a good idea to avoid using a USB cable when copying the files directly onto the device. If the device displays these data in the desired way, then you can try out the next larger unit, such as a map the size of a state. Since it takes some time to create images and copy them to the hardware, you should definitely start working with a small file of about the same size as a map for an individual county within a state. There is a small workaround that can help out with this issue. Essentially then, previews are only possible directly on the hardware. Mkgmap does not deliver a preview as part of the results as is clear from a problem that occurs in developing styles. The software works by generating Garmin-compatible images that are suitable for direct use on the corresponding devices. You will find this Java command-line program in the repositories of numerous distributions. MkgmapĪ very special tool called Mkgmap provides the foundation with which you can create Garmin compatible maps. In addition, device manufacturers often use a variety of different formats for the maps, trails, routes, and other features on their devices, thus making it difficult to use the features. As a result, the data you would like to have is frequently not there.

On the other hand, flooding a map with data would make it unreadable. Prepared maps represent just a portion of the data that is actually available. However, OSM does not always have every feature you desire. Figure 2: There a plenty of online resources for OSM maps for Garmin devices.

Garmin custom maps maximum size