I used
http://www.fertilityfriend.com
It has online learning course which teach you what you need to know. You don't really need to know about your coverline... if you temp each day, FF will automatically note your coverline when ovulation is detected.
You would have 3 days of higher temps which would indicate ovulation has occurred. Your temps don't tell you
when you will O but rather confirm that you
have Od. However if you take note of your cervical mucus (CM), each day, that can tell you when you are moving into the fertile phase.... meaning it's BDing time!!!