Probably just following the GPS nav in his dash and not looking outside much.
We have had two tourists drive into the ocean down boat launching ramps doing that. You have to think seeing boats and water ahaead would be a clue.
There are usually a couple of trucks at the Santa Cruz ramp that are launched by boats every year. Sometimes tidal surge often combined with failure to set that brake thing. If the bite’s on many don’t see the humor while waiting.