Actually, 6 months ago, I extracted the iGO IPA, copied maps and POI into the IPA, signed it, and sideloaded it into my phone. The maps wouldn't show up unless I started a free trial, but it'll keep working even after the trial ends. I suppose because of the license. I just wanted to share this in case anyone wants to try it out. The only problem with this is that you can't sideload new versions; maybe old ones work.