The table below lists the minimum number of anchor APs for common deployment scenarios. For a list of supported APs, see Supported APs for AFC in Canada and the United States.
| APs | Minimum Number of Anchor APs |
|---|---|
| 70 | 4 |
| 80 | 5 |
| 100 | 6 |
| 120 | 7 |
| 140 | 8 |
| 170 | 9 |
| 200 | 10 |
| 225 | 11 |
| 250 | 12 |
Building properties often determine the degree of shielding blocking the GPS signal. Install anchor APs as close as possible to the building perimeter, such as on an outside wall or near an outside window. You should also choose the anchor AP's location based on the availability of the GPS signal. Determine the best anchor AP position by surveying the GPS signal with a smartphone application. See Measure GPS Signal Strength.
Plan also for the mounting height of each AP. The height must reflect the antenna height above ground and not the building floor. See Site Floor Plan
And finally, place APs less than 20m (65.61 ft) apart for FTM 11mc AP-to-AP ranging connectivity. Each AP must be able to range to 3 other APs.