What does "factory re-certified" mean -eBay GPS

Probably means warranty return, fixed and resold.

I bought a GPS Magellan 330 from Ebay l the USA several years ago pre-loaded with Australian maps etc... for considerably less than what it was going to cost in Aus and have not had one problem with it to date.

It basically serves as an aerial for my laptop now.
( I prefer to look where I'm going rather than at the laptop.)

You see a lot of stands set up in shopping centres with re certified goods.

The other answers are basically correct, warranty returned goods, as warranty repaired goods go back to the customer, or the goods are the result of a manufacturing error and are sold to a third party who repairs the goods and then resells them under the licence of the manufacturer.

Sometimes it is not financially beneficial for companies to repair goods that have come of the line dead so the goods are written off and sold to third parties for repairs.

Baldman