It is not uncommon for HOAs to attempt to overreach in matters such as this. Could a hand drawn map be important in this case? Yes. Is that likely to be the only determining fact? No. Defending your property is likely to be a very technical issue defined by a lot of facts, public records, testimony, etc. I recommend that you have a conversation with one of our attorneys to explore this in more detail and to discus your rights, remedies, risks, and options before you engage with your HOA. We only represent homeowners against HOAs not HOAs against homeowners.