At Navigator, we report on link clicks, which means we track when a user clicks on your ad and lands on your website. A session is logged when a user lands on your website and triggers the javascript in your code to log a session within Google Analytics. While link clicks and sessions are not a one-to-one correlation, we typically expect them to be around 80% to 90% accurate. If you notice a large discrepancy between our reporting and your Google Analytics data, please contact us immediately to investigate.