Profmum, you're flat wrong on this one.
Mom ONLY needs permission IF she's leaving San Diego county, and EVEN IF she IS, there is no way at all Dad could enforce that portion of the order. He could file contempt, sure.... but he'd lose.
MOST orders (and we don't know FOR SURE about this one) simply say that the children will use one parent's address for school purposes. If that address changes, it's a foregone conclusion that the child's school will change and will still use THAT parent's address. Especially if the other parent is not in close enough proximity to maintain the original school choice.
This isn't an issue that "Joint Legal" comes into play because there is really no "decision" to be made. Now, if Mom has the choice of several schools, all in the same district and all convenient for HER (because remember Dad is across country), then Dad has some say - but no way does he have a CONTROLLING say as he's not close enough logistically for a judge to rule in his favor and inconvenience Mom in any way.
I get what you're saying, really I do. But IN THIS CASE, with the facts as presented, what you're saying isn't correct or practicable.
I will also add that a judge cannot willy nilly deny a relocation either. A judge can only deny a relocation if the judge is willing to put the child(ren) in the custody of the other parent to keep the children in their current community/school...or if the relocation has a negative impact on the non-relocating parent, and is willing to put the child(ren) in the custody of the non-relocating parent in order to prevent that.
Any move this mother would make within the continental US would have no negative impact on dad, because she cannot get any further away than she is now. Any place else would be closer. If she moved somewhere remote/rural then it might up transportation costs, but a judge can easily make her responsible for that.
Since dad is not in the area a judge cannot put the children in dad's custody in order to keep them in their school/community either.
A judge also cannot prohibit mom from leaving San Diego county at all, a judge can only prevent the children from leaving San Diego county. An adult US citizen has the constitutional right to live anywhere they like in the US. A parent also has the constitutional right to the care and control of their children.
Since the judge cannot force the children to stay in San Diego county, and still be in the custody of ONE of their parents, a judge cannot force the children to stay...period.
Profmum really doesn't understand how joint legal custody works in terms of educational decisions if she believes that an ncp can stop a move simply by objecting to the children's school changing. It can be a factor if the parents live in the same community, but only a factor.