Test with starting point at Somerton using research library (N-squared) matching algorithm and cache size 20

Cache is built using a square with sides 20 km. User's path has steps of (2000, 2000) metres, with a total of 11 retrievals. Amount of look-ahead (both E and N) is 20km. Cache size is 20. (Size is set as a fixed value, derived from original size of 114).

Point furthest from the centre of cache (37000000, 15000000) is 3784280, 1640801; distance away is: 16.3267 kilometres.

Results for Somerton (OS 350,130) using research library (N-squared) algorithm and 20 look-ahead
Threshold Total benchmark retrievals Retrievals lost
50% 0 0
20% 1 1
10% 11 7
5% 456 363

Non-default algorithm used was: Context Matcher with N-squared location-matching algorithm: version of Jan 4 2003.

Commentary on this starting point: the cache is centred on non-prime tourist area, but there are prime areas nearby (10 to 30 km).