the limit appears to be no more than 1024 concurrent location
requests.

for example:

with number of samples=128, the limit is 8 paths
http://www.william-map.com/20100703/1/128.htm

with number of samples=190, the limit is 5 paths
http://www.william-map.com/20100703/1/190.htm

with number of samples=512, the limit is 2 paths
http://www.william-map.com/20100703/1/512.htm

so in general if number of samples is n, then limit = floor(1024/n)

samples, limit (<=1024), next (>1024)
125, 8=1000, 9=1125
128, 8=1024, 9=1152
145, 7=1015, 8=1160
150, 6=900, 7=1050
190, 5=950, 6=1140
200, 5=1000, 6=1200
250, 4=1000, 5=1250
256, 4=1024, 5=1280
300, 3=900, 4=1200
341, 3=1023, 4=1364
342, 2=684, 3=1026
350, 2=700, 3=1050
400, 2=800, 3=1200
450, 2=900, 3=1350
500, 2=1000, 3=1500
512, 2=1024, 3=1536

...

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