Slow, wrong location and speed???

[PJM3]

3970/Emtac Nav 2.2 very strange> today I started out with trying to route from Croydon to Popham in Hampshire. Locked up twice, soft reset. Then wrong location, about 50 to 300 metres out. Then really slow reaction to movement. ie 0mph when I am up to 20mph and then still showing 24mph when I am already stopped. Gave up trying to navigate after 4 attempts at a complete reboot. After leaving Winchester just switched it on and let it track. Got to within 2 miles of home and set to navigate home, worked fine. Is there a recalibrate key to hit if this happens again? ps This morning it was showing 10 sats when all the aggro was occurring. Odd that with my average 5 - 8 it seems to work fine.

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