On the Gjøa oil and gas field, the operator, GDF Suez, has installed a Subsea Condition and Performance Monitoring (CPM). The CPM system is designed to maximize production uptime and maximize asset availability. Access to qualified and continuously-updated knowledge about integrity of the subsea assets are of utmost importance for making the right decisions at the right time in terms of maximizing profitability of the reservoir development.The CPM system collects all subsea data, both process and housekeeping data, in real time. It takes integrity monitoring beyond traditional key performance indicators (KPI) by taking a holistic approach and utilizing all available data and information, where design parameters, criticality, system experience and operating philosophy is modeled and built into what is defined as Technical Condition Index (TCI).The TCI enables the user to detect problems from the large amount of subsea data available, and to determine how severely it impacts production and system availability. The technology utilizes existing instrumentation. By modeling each TCI, assigning weights, building the hierarchic model and defining the aggregation rules, the CPM system and service is encapsulating the in-depth knowledge about the subsea production facility, making CPM an excellent tool for decision making. Finally, both Operators of the field and the support team of the subsea contractor will, through online access to the same tool, jointly be able to take the best decisions for the maintenance of the field. GDF Suez will explain the positive impact and their experience of using the CPM on the daily operations of the Gjøa field in the North Sea in terms of costs, technology understanding and productivity. Operational examples will be shared where the CPM played a key role.