What is the range for terminal guidance flag?

How many nautical miles?

Does it depends of the range of the weapon?

I think the same range fixed for all  Active Radar Terminal Guidance missiles, remember perhaps 10 nm.

For missiles against air targets it should be when less than 10 seconds from the target.  Against other targets it should be when less than 30 seconds from the target.

seeker_range = (missileSpeed * 30) / 3600;
if (is_air(target) || is_missile(target)) then
       seeker_range = (missileSpeed * 10) / 3600;

On 4/7/2022 at 7:59 PM, TonyE said:

For missiles against air targets it should be when less than 10 seconds from the target.  Against other targets it should be when less than 30 seconds from the target.

seeker_range = (missileSpeed * 30) / 3600;
if (is_air(target) || is_missile(target)) then
       seeker_range = (missileSpeed * 10) / 3600;

So AIM-120A/B AMRAAM has a terminal guidance of 2295 * 10 / 3600 = 6.375 nautical miles.

And AGM-84D Harpoon has a terminal guidance of 561 * 30 / 3600 = 4.675 nautical miles.

Aren't they?

1 hour ago, jugasa77 said:

So AIM-120A/B AMRAAM has a terminal guidance of 2295 * 10 / 3600 = 6.375 nautical miles.

And AGM-84D Harpoon has a terminal guidance of 561 * 30 / 3600 = 4.675 nautical miles.

Aren't they?

Yes, I wouldn't bet on it being exactly that range (i.e. could be a second of travel closer to the target before entering terminal guidance) but your examples are on target.

And what about IR/laser guidance?

AA-10 Alamo B has IR/laser guidance, range of 25.6 miles and speed of 2008 knots.

Is it pursuing enemy target all the way starting at launch?