Britannia Royal Naval College's bridge simulator unit features photo-realistic recreations of key harbours for trainees to hone ship piloting skills. "Whereas in the past you'd just see a row of houses, now there are specific buildings," explains Lieutenant Sam Stephens, head of navigation at Dartmouth. Buildings such as the distinctive Wilton Hotel on Plymouth's Grand Parade. It's painted gold - like the real thing - and you can clearly read the lettering. The same goes for the Spice Island Inn in Portsmouth. Portsmouth Harbour is the pièce de résistance of the upgrade.