Return the internal GPS position or nil if no valid hardware found
@status current Introduced in 2.2.2
none
table
representing the current radio position
lat
(number) internal GPS latitude, positive is North
lon
(number) internal GPS longitude, positive is East
'numsat' (number) current number of sats locked in by the GPS sensor
'fix' (boolean) fix status
'alt' (number) internal GPS altitude in 0.1m
'speed' (number) internal GPSspeed in 0.1m/s
'heading' (number) internal GPS ground course estimation in degrees * 10
'hdop' (number) internal GPS horizontal dilution of precision