I'm not sure if this is exactly what you're looking for but two good programs you will find on the internet are GPStrackmaker and Mapdekode - using trackmaker allows you to create your own maps from your own tracklogs.
Next you use Mapdekode to convert to Garmins Mapsource file format so you can download your own maps of your own area into your GPS unit.
All the instructions are there for download - I've tried it and it works ok although it's a little complicated to follow.
Have a look at them and see what you think.
Regards
Ralph
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