Yes it happened to me at start mission, but radar contacs come back if you submerge and surface.
Another thing i experienced, was i loss al air contacts after upgrade to SJ-1... may be the combination SJ-1 and Improved SD doenst works fine.
At next mission, i change my SJ-1 by an standard SJ, and stay with SJ, and Improved SD, and air contacts comes back...
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