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I have complete set of 1:50000 maps of Sri Lanka in .tiff format. They have .TFW files accompanied with them. Now I need to create maps to use with my etrex 20 device using those tiff files. How can I do it?

Thank You.

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I think that we need some more detail about what you are doing, like scope of the project and how it will be breaking it up. You probably don't want to import all of this information in your device at the same time. Also, what do you need from these maps? Do they have topography, other features, etc? As for how to get them onto the Garmin, I would start at the support site for your device: eTrex 20. There you will find manuals, etc. – Get Spatial Oct 26 '12 at 21:16

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Garmin Products require JPEG format

You Can use Google Earth to Create Custom Maps for Garmin

"Garmin Custom Maps require your map be saved in JPEG format. If your map is printed, scan the map at an appropriate resolution¹, and save the image as a JPEG. If your map is electronic, such as a PDF, it may require conversion using GIMP or another suitable program to save it as a JPEG."

http://www8.garmin.com/outdoor/custommaps_instruct.pdf

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