I thought it was to let you know if the map changed?
Its primary purpose is to let you know of a status change in the property.
Generally the LOL monitoring will only notify you if the status of the property changes, i.e. went from out to in or in to out of a SFHA. If the map changes and there is no status change to the property most likely you won't be contacted under the contract terms.
Our city and county just went through a re-mapping with the effective date of the new map being 12/17/10. We only received notifications for status changes.
PS. This link will give you the effective date of the most recent map.http://www.fema.gov/fema/csb.shtm