REP, prefer not to say location just yet but you can probably work it out from other posts.
The international students I can deal with. It can take a while but you eventually get there. Its the ones who say nothing and don't respond to calls on any freq's. The ones that really piss me off are those that change direction when you try to call them and then the transponder goes off.
If they make a mistake, thats fine. If your not sure about position or airspace, call. Respond to the call if you hear it and we can keep everyone safe. Most do a good job but the ones who stuff it up seem to be increasing.
4 in two days may not seem a lot but each VCA requires everyone to broadcast, then you don't know where they're going or what level or even if they are in trouble. Then there is traffic and separation issues, all kinds of problems.
If in doubt call.
Capt Fathom, your right. I'm astounded at the number of times I have asked if they have a VTC on board and the response is no. Technology is great until it fails.