I've had a number of questions via e-mail about doing this recently and figured it'd be helpful if I just wrote a tutorial for average folks to use. There's a really in-depth tutorial at GPSFileDepot for making things like topo maps. While that method will work for this and be more customizable, this way works for folks who are not map/computer geeks.
Making Transparent Maps for your Garmin GPS with GPX2IMG | The GPS Geek
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