Horizontal Curve Layout is a VB.NET Windows Forms program designed to calculate and present the field data required for setting out a simple horizontal circular curve in surveying and road alignment work.\n\nThe program allows the user to enter the main curve data, including radius R or degree of curve D, central angle DELTA, station interval, and either a known PC station or PI station. It supports both Imperial and Metric units, with automatic unit conversion for input and output values.\n\nThe program calculates the main curve elements such as Tangent Length T, Curve Length L, Long Chord LC, External Distance E, Middle Ordinate M, and the stations of PC, PI, and PT. It also generates station-by-station field data for four layout methods:\n\nPC Deflections: STA, ANG, LC, SC, DELTA, PI, PC/PT\nPI Deflections: STA, ANG, DIST\nTangent Offsets: STA, TD, TO, T\nChord Offsets: STA, CD, CO, L\n\nThe program includes a Presentation tab explaining the method, equations, symbols, and example values; a Data tab for input and summary results; a Results tab for complete station outputs; and a Graph tab showing the corresponding embedded figure for each layout method with a scrollable results table.\n\nIt also supports opening and saving projects, printing calculation notes, and exporting clean CSV reports. The program is intended as an educational and technical support tool for horizontal curve layout calculations, while final field use should always be verified by a qualified engineer or surveyor.