I think it's network, which, I don't get but, considering all the other mystery...

I don't know Luffy. If that Karsa woman is right and we got pulled out of our world it might not be so easy to find an exit. [ Nami tilts her head back and sighs before she looks at the communicator again, raising her eyebrows at him as she adds, dryly. ] Lucky you have such a good navigator, right? [ That they're lost makes her feel very responsible. They're not supposed to get lost under her watch. ]