In most places in the US, rescue is free as long as it's legitimate and you weren't being completely reckless. They may chose to charge for false alarms, or if

In most places in the US, rescue is free as long as it's legitimate and you weren't being completely reckless. They may chose to charge for false alarms, or if you did something that was completely and unambiguously boneheaded (e.g. the person who called for help three different times on the same trip for trivial comfort issues). But they usually prefer not to charge, since it would deter people from calling from help in a real emergency. Rules very from state to state though. And outside the US, having to pay for rescue is more common.