Test with starting point at Plymouth using research library (N-squared) matching algorithm and cache size 30

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 3km. Cache size is 30. (Size is set as a fixed value, derived from original size of 59).

Point furthest from the centre of cache (25000000, 05600000) is 2283220, 0550800; distance away is: 21.723 kilometres.

Results for Plymouth (OS 247,053) using research library (N-squared) algorithm and 3 look-ahead
Threshold Total benchmark retrievals Retrievals lost
50% 0 0
20% 3 0
10% 40 0
5% 357 115

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

Commentary on this starting point: this may be a favourable case as the cache is centred on an area with lots of attractions, and the area outside the cache has fewer attractions; the cache may, however, be smaller as Plymouth is on the sea, so part of the cache area covers the sea -- which has no tourist attractions.