From the north and the west via M3/M27
From M3, follow signs to M27 eastbound, sign posted Portsmouth/Fareham/Airport. Leave the M27 at junction 12, sign posted Cosham. At the traffic lights take the right hand lane to turn right into Western Road, carry on down the dual-carriageway into an elongated roundabout. Keep right and enter IBM North Harbour from this roundabout.
Coming from Alton via the A32, join the M27 eastbound to Portsmouth at junction 10 just north of Fareham, then follow directions as above.
From the north and east via A3M/A27
These routes meet at the interchange to the south west of Havant. Follow the Portsmouth signs, ignoring the Southsea exit, but do not join the M27 or M275. Leave the A27 at exit sign posted 'Cosham and non-motorway traffic' keeping to the right-hand lane of slip road. Get into middle lane at roundabout and take the second exit. You will need to move over to left lane as you pull onto roundabout. The entrance to North Harbour is first on the left (clearly sign posted) at the next roundabout.
Please note, if you are using SatNav, you will need to use the next door Lakeside postcode, PO6 3EN, to get to IBM North Harbour.
Intercity trains run from London Waterloo to Havant and Portsmouth and Southsea, both about five miles from the Portsmouth location. On arrival at these stations it is probably easiest to take a taxi to the location. The nearest local railway station to IBM's location is Cosham.
It is possible to catch a shuttle bus from the Cosham Bus Terminus (approximately five minutes walk from the station). From the main station exit, turn left across the railway lines where you will come to a small bus station on your right. The shuttle bus timetable can be downloaded here (PDF, 200KB).