northwest of Main Island is Holgate Shoal, an area of shoals named by the UK-APC for Able Seaman Ralph A. Holgate of the Owen, which charted the shoal in 1961.
northeast of Main Island is Holgate Shoal, an area of shoals named by the UK-APC for Able Seaman Ralph A. Holgate of the Owen, which charted the shoal in 1961.