Figure F2. Location of proposed Site OSN-2 (star) is shown superimposed on a free-air gravity anomaly map derived from Geosat and ERS-1 data (courtesy of David Sandwell and Walter Smith). Other sites shown are the Hawaii-2 Observatory (H2O = diamond), where a hole will be drilled and cased during Leg 200, the OSN-1 observatory, where a hole was drilled and cased during Leg 138, and the notional site (circle) proposed by ION/OSN documents to fill a coverage gap west of the Galapagos Islands. The proposed OSN-2 site replaces the notional site and fills the gap for the region. Additional second priority ION/OSN notional sites lie between Sites H2O and OSN-2. Port calls for the beginning and end of the Leg 203 are in Balboa and San Francisco (squares), respectively.
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