A U G... There is a lag in data transmit for A and B transponders in accord with the AIS protocol. A (commercial vessels) more frequently based on what is called a "Slot Map"(a map of available times to transmit) managed by the transponder and the AIS satellite/ground system. The update rate ranges from 3 minutes for anchored or moored vessels, to 2 seconds for fast moving or maneuvering commercial vessels, the latter being similar to that of conventional marine radar. And then B (pleasure craft) transponder which follows a similar slot map plan but at a slower refresh about ever 30 seconds.
Add to this protocol there are individual systems some operating inefficiently and some a little glitchy. That your display has the occasional hiccup should be expected. It is a reminder not to put all your faith into one system.
Add to this protocol there are individual systems some operating inefficiently and some a little glitchy. That your display has the occasional hiccup should be expected. It is a reminder not to put all your faith into one system.