After you have requested a square to survey (see sign up map), you will automatically be emailed a link to a web site, where you can book and borrow a detector to use for the survey from a Bat Monitoring Centre of your choice (see reserving a detector for more information on this process). This system will give you more information on the best point of contact, opening hours and whether you need to contact the centre in advance.
Please note that this survey requires three different points (ideally at least 200-meters apart) to be surveyed within a 1-km square. Under some circumstances, for example in remote areas, where getting to three different locations would be difficult, a single location within a 1-km square may be surveyed. Ideally recordings are made on three consecutive nights.