Well, leaving Croatia and entering Montenegro was easy. Just make sure you have the right paperwork including Insurance, Registration and Captains Licence (like anywhere), fly the Q flag and their national flag (like anywhere) and all goes well. We asked in Dubrovnik, and even though its only another 6 NM to the SE we were told we had to check out at Cavtat as the last port prior to the border, so we did, and it was easy. Rounding Cape Osta, Zelenika is the first Customs entry port for Montenegro when sailing from Dubrovnik. We had great September weather with f4 sailing and clear blue skies ... Again!
The picture is leaving the customs wharf at Zelenika.