The presentation of the Cadle Cup to Georgetown was a mere formality yesterday at Thompson's Water Sports Center. The host Hoyas, with three times as many crews entered as any of the other five schools, easily won the point trophy siginifying the area's rowing supremacy.

Georgetown won the varsity eight race on the potomac, but with the prestigious Dad Vail Regatta a week away, much improvement remains necessary if the Hoyas hope to compete with such circuit powers as Coast Guard, Trinity (Conn.) and Florida Institute of Technology. The Georgetown women's varsity eight, second in the Vail last year, was soundly defeated yesterday by Navy, which placed third at the Vail.

The Georgetown varsity men got the worst start of the five-shell race and, although they held a slight advantage for most of the first half of the 2,000-meter race, needed a strong finish to win. At Key Bridge, mid-point of the race, Virginia moved from second to a two-seat lead it held until 600 meters remained. Then Georgetown, which had been rowing 37 strokes per minute, upped its rating to about 40 to step out on the Cavaliers and win by about one length in 6:02 to Virginia's 6:05.5. Georgetown's lightweight eight was next in 6:08, followed by George Washington (6:13) and Washington College (6:32).

On the Schuylkill in Philadelphia, Harvard held off Navy to win the Adams Cup for the fourth straight time, ninh tim in 10 years ad 28th time since this regetta began in 1933. The two boats were even for 700 members before the Crimson moved to a four-seat advantage and held off a late Navy charge for a 5:40.4 clocking, 1. seocnds better than the Mids and 19.4 seconds faster than Pennsylvania.

On the Severn in Annapolis, Navy's lightweights, who last week won the Haines Cup for the first time since 1975, had another big week, defeating Penn for the first time since 1973. The Mids led by one seat after 500 meters, doubled that margin after 1,500 meters and won by three seats, despite a late penn move, in 5:40 to 5:41.2 for the Quakers.