The Enterprise D Technical Manual that Sternbach and Okuda released, which was supposed to be about as canon as it gets, says warp 10 is infinite speed. Go figure.
Maybe it’s Warp 9.9 that is ever increasing. I don’t really remember, but I distinctly remember reading two different tech manuals describing the “fastest possible speed of any federation vessel” as two entirely different multiples of C, and Warp 10 being defined as the fastest possible speed.
The Enterprise D Technical Manual that Sternbach and Okuda released, which was supposed to be about as canon as it gets, says warp 10 is infinite speed. Go figure.
Maybe it’s Warp 9.9 that is ever increasing. I don’t really remember, but I distinctly remember reading two different tech manuals describing the “fastest possible speed of any federation vessel” as two entirely different multiples of C, and Warp 10 being defined as the fastest possible speed.
Warp 10 was supposed to be unreachable because it was infinite speed and warp speed was rated on a curve. They decided to change that.