North Harbour / Port Solent (Portsmouth) is smaller footprint on the ground but on two floors.
It’s really not far from the motorway at all. Maybe 5 minutes or so.
If coming from the West overshoot and come off at J12 and turn left at the big cross roads.
If coming from the East come off just before the M275 (signed Port Solent) past the Porsche dealer / Village Inn.
If you catch the traffic lights wrong at the Marriott that’ll make the most difference to your journey (it’s about 4 minutes a cycle of the lights).
If you are going to the Port Solent one and then going to Hedge End go out via J12 of the M27 – don’t be tempted to head to J11.
The drag through Portchester can be slow, there are some roadworks on the A27 that way and quite a few of the locals have yet to grasp merge in turn.