iPhone ANT+ bicycling apps that can import a GPS track? Does anyone know if any of the popular iPhone ANT+ bicycling apps have the ability to import a GPS track? 

I'd like to start exploring some of the local trails/routes a bit - I've got .gpx tracks for some, but don't know of any iPhone apps that will both allow the import of the file AND feature any sort of ANT+ tie-in. I normally use digifit with speed/cadence and HRM sensors... I've got a GPS track of where I AM, but really wish there were some sort of approximate "turn by turn" for following some of the trails/routes, especially the urban ones that are not clearly marked.
I use Motion-X as my tracking app and it can certainly import GPX and then navigate from it. It supports some ANT+ (at least HRM). 

Additionally the OpenStreetMap wiki has a good list of iOS apps comparing their functionality.