How do static PGNs differ from dynamic PGNs?

How do static PGNs differ from dynamic PGNs?

• A. Dynamic PGNs are never used for position data.
• B. Static PGNs carry data that changes slowly or remains constant; dynamic PGNs carry rapidly changing data.
• C. Static PGNs are updated more frequently than dynamic.
• D. Static PGNs include only error information.

Answer: (B)

The main idea is how often the data on a PGN changes. Static PGNs carry data that changes slowly or stays constant, such as device identity, manufacturer info, part numbers, software version, and other configuration parameters. These don’t update on every measurement cycle; they’re conveyed as needed when the device is introduced or when a setting changes. Dynamic PGNs, on the other hand, carry data that changes rapidly and is updated frequently, like position, speed, heading, depth, wind, or real-time engine or sensor readings. Because these values vary continuously, the PGNs used for them are transmitted on a regular, often high-rate basis. So static PGNs are for slow-changing or constant information, while dynamic PGNs are for rapidly changing measurements. The other options don’t fit because position data can be dynamic, static data isn’t updated more often than dynamic data, and static PGNs aren’t limited to error information.

The main idea is how often the data on a PGN changes. Static PGNs carry data that changes slowly or stays constant, such as device identity, manufacturer info, part numbers, software version, and other configuration parameters. These don’t update on every measurement cycle; they’re conveyed as needed when the device is introduced or when a setting changes.

Dynamic PGNs, on the other hand, carry data that changes rapidly and is updated frequently, like position, speed, heading, depth, wind, or real-time engine or sensor readings. Because these values vary continuously, the PGNs used for them are transmitted on a regular, often high-rate basis.

So static PGNs are for slow-changing or constant information, while dynamic PGNs are for rapidly changing measurements. The other options don’t fit because position data can be dynamic, static data isn’t updated more often than dynamic data, and static PGNs aren’t limited to error information.