Maps, either in “traditional or digital forms” are considered the prime source for spatial data that applied to represent the shape of the earth and to define the features positions. According to the recent advancement of the satellite geodesy, especially GPS, as a major source of the surveying data that applied for mapping purposes and produces coordinates that defined with respect to the World Geodetic System 1984. The coordinates of GPS are taken directly everywhere and projected for mapping using UTM projection. Most of the users are not familiar with the details of coordinate transformation and projections. Therefore, this paper is prepared to help the non specialized user to exchange between geodetic coordinates (φ, λ) to UTM projection and vice versa using the polynomial with different orders. The area of Egypt (25° E to 37° E) is divided into 5 regions. The behavior of the polynomial is assessed using check points to specify the proper order with each region. The 4th and 5th order gave the best results according to the particular region. In order to test the proposed methodology a computer package is designed and the results are analyzed and checked.