Final answer:
A notary on a subdivision map verifies the identity of signatories, witnesses their signatures, and adds their own signature and seal to ensure the legal integrity of the map.
Step-by-step explanation:
A notary on a subdivision map is responsible for notarizing signatures, which means they confirm the identity of the individuals signing the document and witness the signatures to attest that they are genuine. This is a critical step in ensuring the legal integrity of the map, as it officially documents that the represented parties have agreed to the subdivision as outlined in the map. The notarization process usually involves verifying identification, watching the signatories sign the document, and then the notary adds their own signature, seal or stamp to confirm that the signatures are valid and were made willingly.