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Explorer Challenges

The Explorer Challenges are based on the Ordnance Survey Explorer maps. To qualify for these challenges you need to have found caches in the same number of squares of the map as the map number itself. For example the first cache placed in the Explorer series was GC37A2A Explorer 133 Challenge. That challenge is based on the OS Explorer 133 map which covers Haslemere & Petersfield, and the requirement is to find caches in 133 of the 600 squares of that map. The other challenges in the series follow a similar pattern.


There is a GSAK macro that will help you check your progress on these challenges. I've completed two of them at the moment.

Cache Area the map covers Current status Squares with caches
Unknown Cache GC4KFEW Explorer 119 Challenge Meon Valley, Portsmouth, Gosport & Fareham Progressing 85
Unknown Cache GC3CW70 Explorer 120 Challenge Chichester, South Harting & Selsey Progressing 119
Unknown Cache GC501MB Explorer 130 Challenge Salisbury & Stonehenge Progressing 10
Unknown Cache GC501T6 Explorer 131 Challenge Romsey, Andover & Test Valley Progressing 23
Unknown Cache GC3HEC6 Explorer 132 Challenge Winchester, New Alresford & East Meon Progressing 61
Unknown Cache GC37A2A Explorer 133 Challenge Haslemere & Petersfield Found 166
Unknown Cache GC51MQ3 Explorer 134 Challenge Crawley & Horsham Progressing 36
Unknown Cache GC3ETP0 Explorer 145 Challenge Guildford & Farnham Found 255
Unknown Cache GC3GK87 Explorer 146 Challenge Dorking, Box Hill & Reigate Progressing 127
Unknown Cache GC5102F Explorer 156 Challenge Chippenham & Bradford-on-Avon Progressing 14
Unknown Cache GC45EC2 Explorer 157 Challenge Marlborough & Savernake Forest Progressing 5
Unknown Cache GC4R5NX Explorer 158 Challenge Newbury & Hungerford Progressing 31
Unknown Cache GC5GPTF Explorer 160 Challenge Windsor, Weybridge & Bracknell Mine 167
Unknown Cache GC3KRXX Explorer 161 Challenge London South Progressing 46
Unknown Cache GC51B6F Explorer 162 Challenge Greenwich & Gravesend Progressing 44
Unknown Cache GC4QQBE Explorer 167 Challenge Thornbury, Dursley & Yate Progressing 4
Unknown Cache GC5KMYB Explorer 171 Challenge Chiltern Hills West Progressing 28
Unknown Cache GC55BE6 Explorer 172 Challenge Chiltern Hills East Progressing 29
Unknown Cache GC4YE0Z Explorer 181 Challenge Chiltern Hills North Progressing 11


Copyright Colin Backhurst.
Last revised: July 9, 2017.