Originally posted by DeV
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Or use a satellite
no AIS detected on Sat pass
You put up that link to NG RMP as if it was a rebuttal to ropebags quip about the cost of operating satellites. The reality is commercial satellites are already up there repeating AIS frames captured mid ocean - we can see that information on marine traffic, so I think it's safe to assume the NS also utilises that data - but if the vessel is not transmitting, we don't know it's there unless:
1) An OPV can detect it (it will need to have a LOS, so very limited detection range or you'll have to hope the crew are playing on LF/MF/HF and you happen to be listening at the right time)
2) CASA detects it - much more likely, provided it's up there and the radar is working.
3) A tip off from a friendly neighbour
So again, a satellite AIS repeater is as much use as a Secondary Surveillance Radar - it requires a co-operative target. If you want to get in to active detection with satellites e.g. with radar, be prepared to spend hundreds of millions.
Shore based CCTV and VHF/UHF radar is severely limited in range.
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