Carrier qualification trials on the training carrier USS Wolverine and escort carriers USS Core and USS Charger in 1942 found that, despite visibility issues and control sensitivity, the Corsair was "...an excellent carrier type and very easy to land aboard. It is no different than any other airplane."
Two Navy units, VF-12 (October 1942) and later VF-17 (April 1943) were equipped with the F4U.
By April 1943, VF-12 had successfully completed deck landing qualification.
VF-17 went aboard USS Bunker Hill in late 1943, and the Chief of Naval Operations wanted to equip four air groups with Corsairs by the end of 1943.
The Commander, Air Forces, Pacific had a different opinion, stating that "In order to simplify spares problems and also to insure flexibility in carrier operations present practice in the Pacific is to assign all Corsairs to Marines and to equip FightRons [fighter squadrons] on medium and light carriers with Hellcats."
VF-12 soon abandoned its aircraft to the Marines. VF-17 kept its Corsairs, but was removed from its carrier, USS Bunker Hill, due to the above-cited policy.
The RN's first Corsairs were delivered in May 1943 to the British Admiralty Delegation (JT102) at Floyd Bennet Field, New York, USA.
In August 1943, the first Royal Navy operational Corsair squadron, 1835 Squadron at Quonset Point, USA received its first batch of 95 Vought F4U-1s, which were given the designation "Corsair [Mark] I".
So the USN had fully carrier-qual'ed the F4U before the RN ever got their first evaluational F4U!
The only reason the USN reversed course and moved all the Corsairs to land operations was logistics.