public String getProjectionConfig() {
        return "{" + WP_PROJECTION_CONFIG_KEY +
            "|" + this.projectionType.name() +
            "|" + (this.projectionFormula1 == null ? "" : this.projectionFormula1) +
            "|" + (this.projectionFormula2 == null ? "" : this.projectionFormula2) +
            "|" + this.projectionDistanceUnit.name() +
            '}';
    }
tries to retrieve waypoint id from clipboard
returns the id, or -1 if no waypoint (with internal prefix) found
main/src/main/java/cgeo/geocaching/models/Waypoint.java