Hmmm, I’m sorry, I don’t remember how much it cost but I remember that it was substantial. Maybe something like $200. My information is a little old now, but we had one fee for staying one week or less and another, much higher rate if we wanted to stay longer.
As for procedure, it is a requirement to have an agent. Best to organise that in advance. Then, you just turn up (we had no trouble using the Boca Grande entrance. Visibility was good) and
anchor wherever the agent tells you to (probably outside Club Nautico Marina) and he or she will guide you through the process. It’s a little long-winded and bureaucratic like most of the countries in central and
South America but with patience should be fine.
Oh, yes, on approach to
Cartagena you call ‘Cartagena Port Control’ on ch. 16. It’s a major port and they speak
English as well as Spanish.