The boat you see in the picture stalking Indian Navy warships is the craft that was mentioned. The American Embassy boat was photographed while she was giving the Indian Navy destroyer, Delhi, a once over by inspecting it from bow to stern.
You won’t find this craft in Jane’s Fighting Ships. Many other vessels used as sentinels by the world’s intelligence services have also stayed below the radar of Jane’s, maintaining their anonymity as they snoop around the world’s sea lanes on special missions.
The craft was once anonymous. The lack of proper registration turned out to be a liability because she stood out when sailing with properly marked civilian craft. She then received Singaporean civilian registration, which was changed at least twice.
When you consider that Singapore sits astride sea lanes through which passes a third of the world’s trade and half its oil, the value of this photo intelligence boat becomes clear.
One of the US Navy officers who served aboard the boat became one of my two academic referees who supported my application for study in the United Kingdom years ago. The other referee was British author, Paul Beaver. I'm forever grateful for their support and friendship.