Number of satellites visible
	RasPi-3, U-blox MAX-M8Q-0-10, downstairs 25 mm patch, south-facing corner Potentially visible (inc. Galileo) Actually used
	RasPi-8, u-blox MAX-M8Q, upstairs Patch antenna, south-facing window Potentially visible Actually used
	RasPi-10, u-blox MAX-M8Q, upstairs Mag mount patch antenna, room interior Potentially visible Actually used
	RasPi-12, u-blox MAX-M8Q, upstairs Near CH radiator Loft dome antenna Potentially visible Actually used
	RasPi-18, u-blox MAX-M8Q-0-10, upstairs Patch antenna, interior, south-facing room (inc. Galileo) Potentially visible Actually used
	RasPi-22, u-blox MAX-M8Q-0-10, upstairs Patch antenna, interior, south-facing room (inc. Galileo) Potentially visible Actually used
	RasPi-23, VK2828U7G5LF GPS module, upstairs In north-west facing cupboard Potentially visible Actually used
Average SNR
	RasPi-3, U-blox MAX-M8Q-0-10, downstairs 25 mm patch, south-facing corner (inc. Galileo) GPS SNR average
	RasPi-8, u-blox MAX-M8Q, upstairs Patch antenna, south-facing window GPS SNR average
	RasPi-10, u-blox MAX-M8Q, upstairs Mag mount patch antenna, room interior GPS SNR average
	RasPi-12, u-blox MAX-M8Q, upstairs Near CH radiator Loft dome antenna GPS SNR average
	RasPi-18, u-blox MAX-M8Q-0-10, upstairs Patch antenna, interior, south-facing room (inc. Galileo) GPS SNR average
	RasPi-22, u-blox MAX-M8Q-0-10, upstairs Patch antenna, interior, south-facing room (inc. Galileo) GPS SNR average
	RasPi-23, VK2828U7G5LF GPS module, upstairs In north-west facing cupboard GPS SNR average
Per-PC GPS data is here, and timekeeping graphs may be seen here.

Other periods: day week month year

How were these plots generated?

Using the Raspberry Pi as a Wi-Fi Plane Plotter server
Installing and configuring the Raspberry Pi
Using the Raspberry Pi as a stratum-1 NTP server