However, newer Garmin GPS units (Montana, Oregon 6x0, and GPSMAP 64) have a limit of 500 tiles on the device in total. 100 jpgs (across all Custom Maps on the unit). kmz-file) on a GPS unit is usually limited to max. The number of Custom Map jpgs (Tiles in your. With the 'Opimize tile size automatically'-flag checked (default), the tile size will be adjusted to the short side of the map in order to produce the minimum number of tiles for the map area. The time for drawing the map on your GPS unit is affected by the file size of the jpgs (which can be controlled by tile size (number of rows and columns) and JPG-compression (quality)). 1024 x 1024 pixel or 2048 x 512 pixel) and should notr be heavier than 3MB.

That way individual maps styled in QGIS can be used as background (raster) maps on the compatible Garmin GPS units, like Alpha, Astro, Dakota, Oregon, Colorado, GPSMAP 62 series, GPSMAP 64 series, GPSMAP 78 series, Edge 800, Montana, Rino, eTrex® 20 and 30.Ī Garmin Custom Map (.kmz-file) is a zip-file containing, one or more jpg-images (tiles), and the georeference infomation in a text-file (doc.kml).Įach jpg-file is limited to 1 megapixel (e.g. kmz-file, which is compatible with Garmin`s Custom Maps format for handheld GPS units. The GarminCustomMap plugin for QGIS 2.0 and later exports the current map canvas to a.

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