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Hey, thanks for the advice, but before I get rid of the etrex 10 I am keen to give this my best shot.

I took a look at the open map website link you provided and I managed to download a street map of my city... it works perfectly. So this is proof of concept that you can upload maps to an etrex 10 in around the 2.5mb size range.

Now rural topo maps for my area were not available on that site but I did a lot of web searching and found some .img maps that cover my area which is absolutely fantastic.

Now for what I hope will be my last beginners question -
Does anyone know of a free or cheap to buy map editing program that will allow me to open a large img map, zoom in and select a smaller part of that map and save it?

Thanks again,
Matt.

Hello all I am new to custom map making and I could use a little help.

I purchased my first GPS on a shoestring budget its an etrex 10. Now I only intend to use this unit at a few places and I have seen youtube videos where you can upload a small img file to the unit. My plan is a to have an approx. 1.5mb map of each area I intend to visit and load it to the unit as needed.

I have free access to online topo maps for my area in tiff format. I tried doing a image overlay with google earth but it will only output to kmz format.

The trouble I am having is getting an img format image.

Does anyone know how I can do a simple file conversion to img, or is there a better way