CARMA is a heterogeneous array, currently with 2 different types of antennae (10m and 6m), and as such will contribute 3 different types of baselines with OVRO-OVRO, BIMA-BIMA and OVRO-BIMA baselines. The latter is currently labeled in the visibility data as a CARMA (nominally about 8m) antennae, the first two simply being ``pure'' OVRO (10m) and HATCREEK (6m) 6.13.
If you want to map anything but a point source in the phase center, you MUST map your source in mosaic'd mode, even if you have a single pointing!