If you're doing a circling approach, it's not going to be a low vis(CAT II or III) so you just need cloud base and RVR above your circling minima. Do check the ops manual though as the company procedure might be different. Other things to consider include those such as can you put the absolute circling minima into the MCP ALT window (you may only be able to put the next nearest 100' rounded up of course), which pilot is flying and what direction is the circling manoeuvre (can you keep the field in sight?)
Hope this helps, sure there are other things which I'm too tired to think of.
PP
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Circling approach
