For the purpose of this ordinance, the City of Mackinac Island is hereby divided into 11 zoning districts known as:

The boundaries of these districts are hereby established as shown on a map entitled "The Zoning Map of the City of Mackinac Island, Michigan," which accompanies and is made part of this ordinance.

Except where referenced on said map to a street line or other designated line by dimensions shown on said map, the zoning district boundary lines follow lot lines or the center lines of streets as they existed at the time of the adoption of this ordinance.

In every case where property has not been included within a district on the zoning map, the same is hereby declared to be in the R-1 low density residential district, except for properties which include frontage on Lake Huron, that are hereby declared to be in the RS shoreline residential district.

Questions or uncertainty concerning the exact location of zoning district boundary lines shall be determined by the board of zoning appeals. The board of zoning appeals in interpreting the zoning map shall apply the standards included in sections 3.03 and 3.04 of this article.