HOW TO - Choose Google Calendars to Sync

Q: How can I select more than just the default calendar to sync to my iPhone/iPad/iOS device?
A: Assuming you already have the iPhone set up to sync your mail using the ActiveSync service, you only need to do three things.

From your Device:

1. Visit http://m.google.com/sync - Log into that account and check the box next to each calendar.
2. Open Settings / Mail / Google Account & turn on Calendars
3. Open Calendar / Click Calendars (top left) / Check the Calendars you want to show up.

This is the updated link:

https://www.google.com/calendar/iphoneselect

Also:
https://www.google.com/calendar/syncselect