Something nobody has mentioned yet that I think is worth adding: what happens when the monitoring reveals something serious?
Everyone is focused on finding him, which makes sense. But the “then what” matters too.
Have a response plan before you find something:
If the app shows him in a neighborhood you do not recognize at 11pm, do you call him first? Drive there? Call the friend’s parent? Knowing what you will do prevents panic-driven decisions that can actually make the situation worse (like calling and tipping him off to the app).
Document patterns, not just incidents:
Most monitoring apps store location history. Use it. A single late night out is different from a pattern of going to the same unknown location every Thursday. Patterns give you something concrete to bring into a conversation or, if needed, to share with a counselor or school.
Loop in a co-parent or trusted adult:
If you are doing this solo, having another adult (co-parent, relative, family friend he respects) aware of what you are doing creates a support layer. You also have a second set of eyes on the data.
Plan for the conversation:
At some point you will want to address this with him directly, whether now or later. Having documented evidence from location history is far more effective in that conversation than vague concerns. Kids this age respond better to specific facts than general worry.
Consider a family digital agreement:
Some families find that setting clear written rules around phones and location (what gets monitored, under what circumstances, and what changes as trust is built) reduces conflict long-term. It frames monitoring as a family safety system rather than punishment, which tends to get more buy-in.