WHERE DOES GERTU 24 START AND FINISH ? The GERTU 24 service is broken down into three stages: Before the trip. Planning each of the steps to be followed and taking the necessary preventive measures. During the trip. During this period of time, a personal manager from the Chamber will be constantly and exclusively available to help your company or group. This manager will have a mobile phone, e-mail and fax, and will be permanently backed by a group of advisers. After the trip. This is an important period of analysis, which is necessary for establishing future strategies.