Hmm, I can't recall @Mad Dog verifying this for us... Awesome dashboard @James331! You should post it, or one like it, on the 'dashboards and dials' thread. https://omegaforums.net/threads/dashboards-dials.28404/
I think it's safe to say both your airspeed indicator and GPS receiver are working properly. What are you flying? I used to fly a Cessna 172. Now I just use X-Plane simulator.
You said “deck”...gotta be either a Navy or a Marine Corps dude...possibly a “puddle pirate” [Coast Guard] dude.