Section 66424.5 - Tentative map; vesting tentative map(a) "Tentative map" refers to a map made for the purpose of showing the design and improvement of a proposed subdivision and the existing conditions in and around it and need not be based upon an accurate or detailed final survey of the property.(b) "Vesting tentative map" refers to a map which meets the requirements of subdivision (a) and Section 66452.Amended by Stats. 1984, Ch. 1113, Sec. 3. Operative January 1, 1986, by Sec. 10 of Ch. 1113.