Joana,

It's easy to confuse these endorsements.  :)

Extended Nonowned coverage is usually and PAP endorsement for company cars that are available for personal use. It extends coverage from the PAP to the company car.

Drive Other Car is an endorsement on the BAP for nonbusiness use of nonowned vehicles.

Named Nonowner Coverage is for an individual who does not own a vehicle, but has the use of a vehicle.  i.e. an elderly parent who lives with you.

I hope this helps.  Please let me know if you have other questions.

Jan