See also Sandandaj on the same date.
The C-601 was a derivative of the Silkworm,
CTX is assuming the main sensor was radar.
The C-601 has a 513 kg warhead compared to the 165 kg Exocet.
When an Exocet hit a VLCC Engine room,
usually the only people killed, were those in the ER.
The counter was to run the ER un-manned.
With the C-601, it appears that this tactic
was no longer effective.
CTX thinks the C-601 was radar guided.
It appears this hit was aft,
but resulted in far more damage than normally produced by the Exocet.