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My 130 never seemed much different, in terms of GPS performance, to the larger units (my 830 often under-reads in the denser parts of Surrey, for example).
In fact, I've been wearing a 5 year old Garmin watch a bit recently and, if anything, it seems more accurate around tall buildings than the 830 - so I'm not sure the size of the unit is necessarily a determining factor in that respect..
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GPS signal strength is pretty weak, so things like tree cover, lots of high buildings, etc., will always have an impact on the receiving unit's ability to meaningfully process and output data.
GPS is also notoriously rubbish at calculating speed on the fly. It's only afterwards, when it has a series of timestamped coordinates, that it can produce an accurate picture of actual travelling speed.
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Rod_Munch
andyp
@tertius
I have the super tiny Garmin 130+ and it works brilliantly for my needs except it very easily loses GPS signal/under-reads on speed etc. if there is a decent amount of tree cover or similar. Does anyone know if this is particular to the 130 (maybe because it is so small the GPS antenna is bit weedy) or is it the case with all Garmin devices of this ilk?