Purpose: The research purpose is to, in a systematic way, build a method to develop suggestions regarding layout planning of gates in a marine terminal and additionally conduct a base for a simulation model. Approach: Firstly, a literature review has been conducted in the fields relevant to port security and gate configurations in marine terminals. Secondly, a case study has been executed in a Swedish marine terminal. The case study consisted of interviews and observations at the case company, who also provided this thesis with numerical raw data. Additionally, a benchmarking was conducted at a company in the same port area where interviews and observations was executed.   Findings: The findings in this thesis resulted in a methodology improvement, which contains important procedure steps that need to be considered while conducting a layout for a gate in a marine terminal. The procedure resulted in a conceptual model that was conducted as a result of the literature review and verified by being tested in the case study. Limitation: The thesis is limited to one case company. Even though it verified and validated the findings, additional case companies are recommended to fully validate the conceptual model which applies for further research. Further limitations to this thesis is that the financial- and technical factors will not be executed.   Theoretical implications: Companies who plans to increase the security in their marine terminal area or implement a new gate system can benefit from the findings. This thesis contributes to science by adding new theory.   Practical implications: This thesis conducted a conceptual model for a layout procedure which recommends to follow while planning a layout for a gate in a marine terminal. The model were verified with a case company and provided two layout suggestions that can be implemented at the specific company.