How do I lock my model down using a spatial target. When I walk around my AR experience the model follows me. I would like to be able to walk completely around my AR experience say of a truck and not have the model move

I am using the spatial target for my AR experience and place it the model in my driveway.  When the model is shown and I start to walk around the model it does not stay locked in place even though I am not using any gestures.  So the model follows me around.