I use GPS for geocaching so it sees some use in different areas. I have a Garmin 12 and a Garmin Etrex Venture. Those units have problems with foliage overhead. The effect is worse when the leaves are wet. Itīs not always the older unit that has reception problems. An effect that is even worse is the calculation from reflected signals. The signal strength seems to be OK but the position is off quite a bit. Other geocachers observed this too.
On geocaching events at HAM field days the impact of the HAM activity on the signal strength can be observed sometimes.
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If it isnīt broken, it doesnīt have enough features yet.