More info from the HIMARS in PH
HIMARS’ Failure To Hit Its Target
To simulate a real-world scenario in which troops have to sink an adversary ship, the first HIMARS rocket was targeted at the center mast of the vessel to take out its communication system, while the rest of the five rounds were intended to sink it.
However, the first shot missed the target because the vessel was drifting and “was not in the correct location,” as announced by US military personnel. The first shot missed the target vessel by approximately six to nine meters, while the five other shots hit different points.
A second set of HIMARS rockets were then prepared for firing while the CIFEC calculated the new position of BRP Pangasinan; however, an aerial intruder was detected by the US and Philippine military radars, which delayed the exercise by a few minutes.
“The range is cold because of safety issues, because of an aerial interloper that was reported to have entered the opera box [operational box]. We are waiting for the range to clear. The interloper was a private unregistered single craft aircraft in the middle of the ocean,” a US military personnel announced.
Once the intruder was escorted out of the operational area, the second set of HIMARS rockets were fired, and the exercise continued.
Finally, the US and Philippine warplanes took turns attacking the vessel with guns and bombs. A US Air Force (USAF) MQ-9 Reaper drone flew overhead the vessel, providing images of the target to commanders calling in the strikes.
The final blow was delivered by a Marine Corps (USMC) F-35B Lighting II stealth fighter, and the vessel is said to have sunk at around 2:50 p.m.
So much lol
PLAN already showed ability to hit slowly moving (drifting) sea targets with MLRS last year, similarly guided by drones
Self Propelled Gun/Rocket Launcher
A long range gun seems a lot more vulnerable to counter artillery strikes considering they'll likely have to be extensively stabilised and would definitely be much heavier than PHL-16 trucks With China's extensive manufacturing it's probably easier to stockpile thousands of 300/370mm reload...
www.sinodefenceforum.com
I would expect the US to improve this capability in the future, but for now it looks like catching up.
Similarly, the C-705 sold to Indonesia by PRC failed in a test witness by the President, but it would appear that development continued and Indonesia is looking to produce it locally