During odor-guided navigation, animals combine sensory cues with spatial information to make behavioral choices. The integration of olfactory and spatial information involves a highly interconnected olfactory-hippocampal circuit, yet it remains unclear whether task-relevant odor representations are distributed across this network or emerge within specialized nodes. Moreover, decisions in natural environments often do not just depend on physical stimulus properties, but on higher-order, categorical stimulus features. Here, we trained freely moving mice to learn such an abstract decision rule, whereby odor novelty, rather than odor identity, determined reward location. Simultaneous recordings from posterior piriform cortex, lateral entorhinal cortex (LEC), CA1, and dentate gyrus revealed that neural population activity across the network was dominated by spatial task variables. During odor sampling, the piriform cortex and LEC encoded odor identity and novelty. Remarkably, only the piriform cortex maintained stable novelty representations across behavioral epochs, from odor sampling to reward approach. These findings identify the posterior piriform as a key hub for maintaining abstract, task-relevant representations that link sensory cues to spatial decisions.