Which means you can get away with three on the sea (where the height is known to within about +/- 5m) but not on land, because unless the unit knows the altitude at the fix there will be quite a large error.
"pltrgyst" wrote
Very true. In addition, the less performance-oriented the tires, the more comfy the ride. But of course the chances of finding grand touring tires in his size (255/35R18 or 245/40R18) are rather slim.
Cheers, Pete
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