with today’s GPS shell guiding techology - seeing a broadside of GPS guided rounds would be a beautify thing
DARPA was in the concept phase for exactly that when the ships were retired in the early 90s. 11” subcaliber sabot round. GPS guided with a range of about 100 miles.
There was also a 13” subcaliber sabot shell that was further along and almost in service too. Submunitions, 40 mile range. Not GPS, but the CEP of the Iowas’ guns meant GPS was unnecessary.