No one on a contract has been offered a permanent position other than in Norwegian core (all Scandi folks as far as I know). The company is reluctant to making a base "permanent" after 24 months and is trying (successfully...) to wriggle out of the signed policy agreement. There are in other words no guarantees whatsoever...
You will be based where you are needed (you can of course request a base of your choice but it is, as always, entirely up to the company to put you where they see fit). To sum up: You are, again, a contractor with little or no rights