If you want to use the Hellfires on the missile boat:
First, bring the chopper in at 20-30m altitude, hover it just inside Hellfire range. That puts it outside the 30mm range, and too low for the SA-N-4s to shoot at the chopper. 18.2M is minimum launch altitude on the Hellfires, I think.
Set the Chopper so it doesn't auto-RTB when out of weapons, because if it does, the first thing it'll do is climb as it turns away, and it'll eat a missile. When the chopper is out of missiles, unassign the chopper, immediately pause, so you can set it back to terrain following altitude, then cruise away at that altitude until you're at least 5 nm away from the missile boat, then you can climb.
If you just want to light up the missile boat for the DDG to kill it with missiles:
Leave the chopper in the C ref point area, and climb to ~1000m/3000ft with the radar on.
If you set the quick turnaround checkbox, you can re-arm the 2nd chopper with Hellfires as soon as it lands from sinking the sub. 2 loads of Hellfires will almost always sink the missile boat, and often will disable at least half the SS-N-9s as well. If you're careful with the RTB so that it doesn't climb till at least 5nm away, you can get away w/o a scratch.
Also, if you keep your radar on, and don't use up your SAMs on surface targets, you can handle all six missiles inbound at once pretty easily. Then you can steam in and kill him with 5" shells if you want.
Edit: If you have your radars on, he's probably getting an ESM fix on you to fire his missiles with.
< Message edited by mavfin -- 5/17/2019 4:05:57 AM >