Please note that many of the screenshots in this Instructable look pretty bad. In this Instructable, I'll lay out a simple process I've come up with for making custom maps for Garmin outdoor GPS units and share the entirely free tools I use to do it. So many tools and suggestions, in fact, that it's a bit overwhelming. Of course, they won't tell you some clever tricks to get around them! While it's not possible to completely circumvent Garmin's limitations, there are a wealth of tools online - some free, and some not - that can help you make better custom maps. Garmin has purposefully included limitations on the size and number of custom maps you can upload to your device to encourage you to purchase their premium maps.
Garmin provides instructions for doing this here, but there's a catch.
Even if your unit came with TOPO maps, you can improve the functionality of your GPS by creating and uploading custom maps of areas you explore often. ().saveAsImage('yourpath'+ name +'.If you have a Garmin GPS designed for hiking and other outdoor activities (including the GPSMAP, eTrex, Colorado, Dakota, Oregon, and Montana series, among a few others), you don't have to settle for the bare-bones maps that came pre-loaded on it. Of course you can automate this using the Python consol: from import * Then you go to "Project" -> "Save as image" and you can save this screen as a image, tiff, png. This will set the Qgis map canvas to the Maximum Bounding Box containing your shape. In Qgis load in the Bing WMS server and your shapefiles then you can click on your specific polygon in the attribute table and zoom to this Polygon. I had a similar problem where i downloaded several building shapefiles from Open Street Map and needed to get an image for each building from annother WMS server with aerial images (e.g.Google Satellite). On the other hand if you are just fine with an image of the area of the Maximum bounding box of your Polygons you could calculate these and than automatically clip them from the WMS server. If you want to clip the exact area from the Polygons, i think you can't extract them from Bing Maps.
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