There is a "feature" that confuses many people associated with map zoom level. People complain about contacts that went away when they restored the game and I think the occasional sink icon missing from the map is similar.
What I think is happening is the map is zoom and refresh sensitive (refreshes are necessary to get patrol gaols to change mode for instance.) Certain things like sink icons and contacts may appear to go away when viewed at a different zoom level than the one at which they were created. If you see stuff seem to go away like this, more often than not, it seems to be a zoom in one or two levels will cause stuff to show up. When I don't get a sink icon when I expect it, I look at the Captain's list and I see it there, zoom the map and I see the sink icon. It may also be a refresh issue and zooming is part of the refresh. So far I've only observed the problem, saw there were some apparent work-arounds, and haven't really done extensive testing.
-Pv-
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