This workshop is for Marine Citizen Science (MCS) leaders, data managers, cost-effective technology providers, app developers, and scientists using MCS data. This workshop will introduce CSMACH1 project and its goals, showcasing how to overcome barriers in MCS data flow in order to reach as many people as possible. On the second day of the workshop, the participants will receive live support to address their specific needs related to MCS data. The workshop will be hybrid: online and in person in Ostend, Belgium.