Final answer:
When operating in shallow water or seagrass, if you see a mud trail behind you, it means you should get off the jet ski and walk it to deeper water to avoid damaging the engine and the seagrass ecosystem.
Step-by-step explanation:
When operating in shallow water or seagrass and you see a mud trail behind you, that means to get off and walk the jet ski to deeper water to keep from sucking up sand or seagrass into the engine. The mud trail indicates that the jet ski's propellers are stirring up the sediment at the bottom, which can cause damage to the engine and the seagrass ecosystem. It is important to be mindful of the environment and avoid causing any harm.