You're stuck with the NULL grid, hence no patrol reward. When I'm going to dock at a U-cow, I try to do my patrol first so I get the little renown boost. However, if I can't (say grid too far) I resupply on the way there, remember the patrol grid, and do it anyway. You might be able to set the patrol grid in SH3 commander if you boot from commander before setting out on the patrol where you leave from the U-cow. Not sure though.
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