Many factor may be the cause of your problem, if you are runing at time compression 1X, then the enviromental effects and enviromental fog can cause the visibility reduction.
In heavy fog, when you are able to watch the ships it is too later to submerge.
Plus, if you are into the map station, the visual contact ships icon will depende on the map zoom, if you are at a zoom out level, you never will see the ships in the map you will have a sonar contact or generic radar single icon for the wole convoy, when you apreach a ship or convoy, you must to make zoom in according with the ships contact distance.
Hope can help....
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