Hummingbird 200dx Fish Finder I Own A Hummingbird 200dx Fish Finder. It Doesn't Read The Boat's Speed. What To Do?

I own a Hummingbird 200dx fish finder. It doesn't read the boat's speed. What to do? - hummingbird 200dx fish finder

My Hummingbird 200DX Fishfinder work well with the exception of the boat. The speed and tempeture be painted by the same cable. But I do not tempeture speed. Is it due to a faulty cable, or as the beneficiary on the transom boat or something else installed?