What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?

Changing the ship's course can indeed serve as an immediate remedy for addressing shadowing of the satellite signal caused by an obstruction on board. When the ship alters its course, it can potentially move out from behind the obstruction that is interfering with the satellite signal. This change allows a clearer line of sight to the satellite, helping to restore the communication link.

This option is particularly viable in situations where the obstruction is located higher up, such as a mast, and the satellite signal needs a clear path to penetrate the atmosphere. In ship operations, it is often more practical to adjust course as needed for better signal reception quickly, rather than making structural adjustments or relying solely on technical modifications.

While relocating the mast or obstruction could ultimately solve the problem, it generally requires time and effort that may not be immediately available. Raising the transmit power level or increasing the receiver gain are methods that deal with enhancing the signal but do not directly address the obstruction itself, which is the root cause of the issue.