We arrived here from Brazil in October 2018. No-one answered our calls on channel 16 before we arrived. Finally, once in the marina we called again and the Prefectura answered in Spanish. The marina doesn’t seem to use VHF, so we waited until marina staff found us. They directed us to a berth and took our stern lines to the pontoon, but they can’t help with bow line to the mooring, which made it a bit challenging. Let them know then and there if you want electricity and water as there is a daily charge (unlimited use). Showers ok (paid), free wifi at harbour office. Movistar (in town) sells pre-paid sim cards with very cheap internet bundles.
Formalities: Immigration (passports, boat papers, clearing-out documents from Brazil, 517 pesos to be paid in cash, exact amount), then Prefectura (copies of passports, boat papers and the “Rol”, which for us was the Brazilian Annex 1-A form (with stamps from immigration). Ask immigration to make a copy of the form after stamping it, so you won’t have to go to town again to make a copy to give to the Prefectura. We made copies in town at the “Libreria” shop. On the street facing the beach is the only bank in town, where you can get pesos (needed for immigration) and dollars (not really needed, as you can pay in pesos or with bank card in most places). Finally, the harbour master / hidrografia, which only inspected documents and didn’t need copies.
When we left for Montevideo, we went to pay the harbour master and then had to show our payment slip to the Prefectura.