evidence: The Eastern edge of the Rosalind Bank (the large bank to the NW of Serranilla) is only 7 to 11 metres deep and the seabed rises very steeply to this edge, causing "a race which has the appearance of breakers" according to the sailing directions. The pair of channels running SE / NW which you can see to the W of Rosalind Bank have currents up to 5 knots setting NW. Our neighbours in Grand Cayman - a 100ft US motor yacht - took the direct route when heading north from Panama and had a very rough passage through here, actually damaging the boat's stabilisers. [...] So we decided to have a look at Beacon Cay on Serranilla Bank - the location for this blog - which is either Colombian or an outlying US territory according to which website you look at. The sailing directions describe it as a good anchorage, though that advice is aimed at large ships rather than little yachts. As we approached, the Colombian troops hailed us on the radio, though their total lack of English and our total lack of Spanish (other than 'tres cervezas por favor') made it an unproductive exchange.