Temperature and pressure data were collected using drifting buoy and profiling floats from CHAIN, GILLISS, OCEANUS, and ENDEAVOR from the North Atlantic Ocean from January 10, 1975 to May 31, 1981. Data were submitted by University of Rhode Island; Graduate School of Oceanography in a part of the IDOE/POLYMODE (International Decade of Ocean Exploration / combination of USSR POLYGON project and US MODE). This data set consists of 65 SOFAR float deployments and contains data collected from 1975-81. Included in the documentation is a manuscript titled "SOFAR Float Pilot Studies in the Western North Atlantic 1975-1981- Data Report" by Renee M. O'Gara, H. Thomas Rossby and Diane L. Spain. Technical Report Ref. no. 82-3. This report covers the first 30 floats. Deployments were from the following ships: CHAIN-127, GILLISS 76, OCEANUS-15, ENDEAVOR-07, and ENDEAVOR-13. Floats 32-91 are described in the technical report titled "SOFAR Float Data Report of the Polymode Local Dynamics Experiment", Ref. no. 34-T. These floats were deployed during the R/V GYRE cruise (78-G-6). This research program was funded by the National Science Foundation under grants IDO75-18930, OCE-7818662, OCE-79-26187 and partly by the Office of Naval Research Contract no OO14-76-C-0226. *Note: Although the documentation describes the Deployment of 91 SOFAR floats total, only 65 were actually recovered. Data from the recovered floats and their identification numbers are included in the documentation. Current direction was reported as U/V components; associated temperature and pressure data was reported when possible.