Ignore the fact that I wrote Altimeter accuracy...I mean't barometer! Any mod to change the title?
Nearest weather station is reporting 1010hpa.
My watch is reporting 1004hpa.
Weather station will be reporting sea level pressure, watch will be reporting station pressure.
I'm roughly 36m ASL. so assumming -1hPa per 8m elevation that puts my sea level pressure at 1004+(36/8) = 1008.5
So roughly 1.5hpa off the weather report.
Is that about right in terms of accuracy for these watches? I know my calculation is rough, and doesn't include temperature etc. Also the station 10+ miles a way.