The apex of the Great Pyramid of Giza is incomplete, the top of the building being a 10 meter square plateau of uneven stonework. It has been theorised by academics that this incomplete upper portion of the pyramid has been destroyed by human activity since the pyramid was constructed.

In this paper I show that the apex plateau of the Great Pyramid is an original feature of the building and that the stonework of this level contains a series of rectangular and circular holes which comprise a sophisticated geometric puzzle. I demonstrate that the upper level of stonework is the 202nd level of the pyramid's core masonry and that it is located at an altitude of 202 meters above the lowest part of the pyramids construction, that being at the bottom of the vertical shaft of the underground chamber, when the meter is defined perfectly from the Earth's reference ellipsoid parameters.

I prove that the underground vertical shaft is a 2:1 scale model of the southern underground passage in the pyramid, and from that determine that the architecture of the whole building has been designed to be referenced to sea level and that the elevation of the major parts of the building can be determined through computation, rather than surveying measurements.

I solve the geometric puzzle that is carved into the apex plateau of the pyramid and thereby determine the latitude and longitude relationship between the building's lowest point in the underground shaft, the apex plateau, and the base center of the pyramid.

From this solution I determine the GPS coordinates of the base center point of the Great Pyramid on 26th February 2018 at 07.30 UTC from GPS measurements that were taken on that day by a team of surveyors. I then compute the tectonic plate shift of the pyramid in latitude since its construction by referencing the 2018 center point latitude to the pyramid's orignal latitude which is explicitly given within the building's architecture.