Download GPX files > 1 MB

Hello,

 I got my GPSMap 66 a few days ago. Now I am looking for a solution to download big GPX files via CIQ. I am talking about GPX files with geocaching data. Should this be in general possible? Or is there some file size limitation? As I read in the documentation there is a special makeWebRequest for GPX files which downloads the file directly. Or is there any way to download the data via Wifi?