Was that on the Kensington Stockyards map bounded by Smithfield, Espom, Kensington Roads and the river?
They did a two map course there last year, and had the same problem with maps halfway through.
I'd been thinking myself that it'd be a good area for a sprint race.
Yes it is that area, and past practice has been to hand in the maps at the changeover. I've tried map memory in the past to punt on being able to collect an omitted control (which didn't work because at my speed dropping controls is essential so I didn't bother collecting the omitted control anyway).