@NonNull
    @WorkerThread
    public static List<Geocache> getCachesAround(@NonNull final Geopoint center, @NonNull final OCApiConnector connector) {
        final String centerString = GeopointFormatter.format(GeopointFormatter.Format.LAT_DECDEGREE_RAW, center) + SEPARATOR + GeopointFormatter.format(GeopointFormatter.Format.LON_DECDEGREE_RAW, center);
        final Parameters params = new Parameters("search_method", METHOD_SEARCH_NEAREST);
        final Map<String, String> valueMap = new LinkedHashMap<>();
        valueMap.put("center", centerString);
        valueMap.put("limit", getCacheLimit());
        valueMap.put("radius", DEFAULT_RADIUS);

        return requestCaches(connector, params, valueMap, false);
    }
Client for the OpenCaching API (Okapi).

@see <a href="http://www.opencaching.de/okapi/introduction.html">Okapi overview</a>
main/src/main/java/cgeo/geocaching/connector/oc/OkapiClient.java