Magnetic north is constantly shifting, so its exact location from central California changes over time. To get the most up-to-date information, I recommend checking a reliable source like the National Oceanic and Atmospheric Administration (NOAA) website.

They have a tool where you can enter your location (central California) and it will show you the current magnetic declination and the direction to true north.

Alternatively, you can use a compass app on your smartphone, which will typically provide the current magnetic north direction based on your location.