Different than a Land Survey Plat
An ILC is not a Land Survey Plat or Improvement Survey Plat in which the surveyor performs the necessary measurements and analyses in order to set property corner monuments and be able to certify that this is a "true and correct" survey of the property's boundary. An ILC's property lines are normally ascertained by occupation lines such as existing fencing, curbing, etc.
When in doubt...
At times, during the preparation of an ILC, it is concluded that the site's boundary lines cannot be defined without leading to confusion as to the approximate location of the boundary. In these cases, a note suggesting the preparation of a Land Survey Plat or Improvement Survey Plat may be included.