Not really, relatively about the same distance as Gan in the Maldives. Gan one of the islands of Addu Atol, southernmost atoll of the Maldives - 42 miles south of the Equator. Diego Garcia is part of the Chagos group, about 400 miles further south again. Like the Maldives, they would have experienced waves around 4-5ft at that distance I reckon. Still high enough to swamp the island though as it topped out at around 3-4 ft above sea level when I was there during the initial building stages (Project Reindeer Station).