I move in and out of Singapore frequently. Most times remember
to notify, but a few times genuinely forget. Hopefully, they don't
catch me.
Last time, there are big signboards at Airport, but those seems to
have disappeared or maybe not so obvious now.
Last time also got stickers on MINDEF Notification Centre to stick
on the passport. After I change my passport, cannot find the
stickers, so tend to forget.