A comparison is made between multi-channel infrared (3.7 and 11 μm) temperatures measured by the TIROS-N satellite and aircraft single channel radiometer and AXBT measurements over the Gulf Stream between Cape Hatteras and Savannah, Georgia, on November 27, 1979. After reducing the noise in the 3.7 μm TIROS-N data, a multi-channel method is used to estimate the sea surface temperatures. For a temperature band of 19 to 26¿C, the estimated and AXBT measurements are in agreement within a standard error estimate of 0.5¿C. A bias of 1.2¿C was found between the aircraft radiometer and the AXBT measurements, and part of this bias is attributed to radiometer calibration errors.