1. Worked grid squares
2. List of worked grid squares (April, 2015)
IL18
IM57,IM59
IN51,IN52,IN61,IN89
IO51,IO53,IO55,IO57,IO62,IO63,IO64,IO67,IO68,IO70,IO71,IO73,IO74,IO75,IO76,IO77
IO78,IO80,IO81,IO82,IO83,IO84,IO85,IO86,IO87,IO88,IO89,IO90,IO91,IO92,IO93,IO94
IO95,IO97,IO99
IP62,IP90
JM19,JM49,JM78
JN18,JN29,JN35,JN39,JN45,JN48,JN49,JN52,JN53,JN54,JN55,JN58,JN61,JN62,JN63,JN64
JN65,JN68,JN69,JN71,JN72,JN73,JN74,JN75,JN76,JN78,JN79,JN80,JN82,JN83,JN86,JN87
JN88,JN89,JN92,JN95,JN96,JN97,JN98,JN99
JO00,JO01,JO02,JO03,JO10,JO11,JO20,JO21,JO22,JO23,JO28,JO29,JO30,JO32,JO33,JO37
JO38,JO39,JO41,JO42,JO43,JO44,JO45,JO46,JO47,JO48,JO49,JO50,JO51,JO53,JO54,JO55
JO56,JO57,JO58,JO59,JO60,JO61,JO62,JO64,JO65,JO66,JO67,JO69,JO70,JO71,JO72,JO73
JO74,JO75,JO80,JO82,JO83,JO84,JO89,JO90,JO91,JO92,JO93,JO94
JP30,JP32,JP33,JP40,JP43,JP50,JP51,JP60,JP62,JP64,JP65,JP67,JP68,JP73,JP89,JP99
JQ68
KM07,KM08,KM25,KM27,KM36
KN00,KN02,KN05,KN06,KN07,KN08,KN09,KN16,KN17,KN19,KN23,KN34, KN36,KN37,KN44
KO01,KO02,KO03,KO04,KO06,KO07,KO08,KO13,KO14,KO17,KO18,KO19, KO20,KO28,KO29,KO37,KO38
KO39,KO49
KP00,KP01,KP02,KP03,KP10,KP11,KP12,KP13,KP14,KP17,KP20,KP21,KP22,KP23,KP24,KP25
KP30,KP31,KP32,KP33,KP35,KP36,KP38,KP40,KP41,KP42,KP51
KQ00,KQ21,KQ30,KQ40,KQ50
TOTAL: 233 Squares