The process for making custom maps can be done much easier with the Google Earth’s UTM grid lines overlay function. It takes away the mathematic method of positioning the map overlay.
Recently a hiking buddy preparing for a solo hike on a section of the Great Ocean Walk in Victoria, Australia asked if it’s possible to scan paper maps into his newly purchased Garmin device. A search online turns up resources from Garmin’s website, but their instructions is brief and didn’t address a few issues that I ran into.