I've used ExpertGPS for limited track creation and I can say I find it to be one of the best,,
I've not used it to upload maps, I wasn't aware that you could upload maps to your GPS through ExpertGPS - personally I use a phone app with Offline Vector Maps to maximize space, as picture maps take so much mb of space...
Why not download Garmin Topo Maps for South America to your GPS and just overlay your tracks you are creating,, I know Garmin Maps for N.A. are pretty decent for detail.
Good Luck, let us know what you end up doing.. always interested in this topic
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