Lyman's question about addresses inspired me to figure out an easier way to get precise GPS locations.
If you have addresses of cal courses (keep in mind that addresses can be actual numbered street addresses, but can also be cross streets or the name of a business along the cal course) you can simply enter them into the Google Sheet below and it will generate the GPS coordinates for you.
https://docs.google.com/spread...Nac/edit?usp=sharing
Actually you have only viewing permissions to the above google sheet. You will need to open it and then "Make a Copy" for yourself before entering addresses. Below is a link to the full instructions (also available at the top of the calibration map page).