Radio-echo sounding line locator Radio-echo sounding flight tracks flown by the SPRI-NSF-TUD consortium between 1974 and 1979 are shown as black lines. Click on the blue links to identify individual survey flight tracks, or coverages from each season. Detailed coverages are shown in insets. Entire SPRI-NSF-TUD coverage 1974-75 1977-78 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 001 002 003 004 005 006 007 008 009 010 011 012 013 1978-79 030 031 032 033 034 035 036 037 038 039 040 1977-78 season, Flight 005 Radargrams available Flight track flown but no radargrams available Previous flight | Next flight