There is also : http://gpsnavx.com Which allows also the same thing using any of the charts you own. I receive nothing in any form of compensation from either company for posting about them. Full disclosure. I understand companies wanting a revenue stream, I do wish they would work more on creating a solid product then binding one to their hijacked data. What would one say to solar panel manufactures that wanted you to continually pay to keep their panel working? Where ever I can avoid this form of business I will. Just my two cents.