How to hack megaships?

I may be missing something here, but I can't hack / rob megaships. I'm currently in the Cantjarisni system trying to hack a megaship but it's not working. I scanned the ship so I now see the subtargets, like the cargo bay and the hackable data transmitter. However, when I scan those too, further subtargets (the limpet ports) don't appear. When I want to release a limpet it says invalid limpet target. I can target the module itself but there's no limpet port to pinpoint.

I'm trying both the cargo bay (hatch breaker limpet) and the data transmitter (recon limpet) but they're not working. What am I doing wrong?
 
I'm wondering, is there a search site that I can use to locate the nearest one to my system? just want to take a look, but those I found are quite far from my base.
 
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