Thanks for the replies folks. In general I can conclude that they can see me from much farther than I had first imagined. I do travel at PD during the day and generally surface at night. The issue has arisen usually when I need the extra speed of surface travel to position myself for an attack on ships that I have already seen/ detected, when it is obvious that underwater speed is not going to be fast enough to get me where I want to be.
In future on these occassions I will have to settle for a less optimum firing position. It's all falling into place- slowly!
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