The retrosplenial cortex supports navigation. but there are good reasons to suppose that the retrosplenial cortex has a very different role in spatial memory from that of the hippocampus and anterior thalamic nuclei. For example. retrosplenial lesions appear to have little or no effect on standard tests of spatial alternation. https://www.bekindtopets.com/flash-find-Mega-CMPK-Bolus-50-ct-limited-choice/