I just did a trial run with PVC pipe and the gps seemed to operate no differently than if it was in free air - acquisition time was 20 something seconds each time.
eviltwinzzz, I think you’re on to something. I thought the epoxy would be the most durable (and extra mass is a positive thing) but given the hassles and the fact that I would end up with a large air pocket anyways I might as well just enclose it in PVC.