The purpose of the tentative map is to inform the City Council, Planning Commission and other affected agencies of the proposed subdivision; to allow an opportunity for each to examine the manner and extent to which they may be affected and to respond to the proposed development accordingly; to identify any further official action on matters of zoning, acquisition of access or rights-of-way, and clearly define steps to be taken by the subdivider, his engineer and others for final approval of the development. The map need not include detailed designs of streets, utilities or building sites, but, through provisions of this Division and any conditions imposed with the tentative map, should give clear direction on remaining engineering, surveying and legal matters.