Sail technology requires Bluetooth transmitters to be installed across the entire area to be covered for indoor positioning.
Any iBeacon compatible transmitter will work.
You can use small battery-powered beacons. Alternatively, many WiFi access points have built-in iBeacon transmitters.
However bear in mind that the typical density of WiFi access points and their location (typically in the centre of the area to be covered) are not ideal for positioning. So WiFi access points alone are unlikely to achieve the best positioning accuracy.
We use the word 'beacon' to mean any iBeacon transmitter.
As a rough rule of thumb, allow four beacons (one in each corner) for small rooms. And allow one beacon per 100m2 for large open spaces.
For the best positioning accuracy, beacons need to be installed around the perimeter of any area to be covered.
The beacon map in the web console provides a coverage overlay, allowing you to see where beacon coverage may be insufficient for good positioning.
iBeacons are widely available. They're available from large companies like Kontakt and Infillion (formerly Gimbal), who also provide beacon management platforms. They can also be purchased easily from Amazon, or any number of other sources.
For positioning, high signal strength is beneficial. Crowd Connected can supply beacons specifically designed for positioning, with a much higher signal power than normal beacons. When covering very large areas signal power becomes more important. Please contact firstname.lastname@example.org for more information.