If anyone would like to help find precise locations of cal courses I have now made it even easier. If you'd like to help I will give you Editor access to the spreadsheet located in the picture below.
The process is that you click on the cert ID in the second column to bring up the cert map of the course. You find cross streets on the cert map close to the cal course and enter them into the first column along with the city, state. GPS coords will appear in columns 3 and 4, and a link to a google map will appear in column 5. Click on the map link to confirm the GPS location appears to be the correct location. If any of the steps don't go well (sometimes there aren't obvious cross streets and sometimes the google map that comes up doesn't look like the correct location), just skip the course(delete the address you typed in) and go to the next one. Each course takes 2-3min, and most of that is waiting for the cert map to download, and typing in the address.
I am starting with courses certified in 2022 and 2021, since I figure those are the most likely to be well marked and have good maps. If you'd like to help send me a private message here or email me at runnermark@gmail.com.