TACNAVMODTactical Navigation Modification (P-3A/B Orions after upgrade)
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The US Navy retired the P-3B TACNAVMOD airplane--equivalent to the P-3C Update I--in the early 1990s, at which point it had been flying with the US Naval Reserve for almost 10 years.
Taipei had also raised the possibility of buying used P-3Bs from the US Navy, the TACNAVMOD version of which is comparable to the P-3C Update II.
However, the introduction of the P-3B TACNAVMOD in the early 1980s was a huge leap in antisubmarine and maritime-patrol capabilities.