To stand on (or touch by hand when sea conditions or the shape of the available land precludes a safe landing) as many as possible of the 1 km squares of the Ordnance Survey National Grid within which there is some land, of any size, and which is above high water in calm conditions. There is a total of 2,248 such squares, 10 of which have been accessed by touching. These were Muckle Roe, W side, 1 July 2005; Yell Sound (5), 8 July 2005; Fair Isle (3), 10 June 2007; Foula, 30 June 2007. There remains 10 to be visited, most requiring very fine weather. The first column contains the Ordnance Survey National Grid 10 × 10 km square reference. The number of 1 × 1 km squares within the larger square is given in the second column. Squares containing only salt water with no land at all are excluded. The third column gives the number of squares not visited. Their identity appears in the fourth column.
HP60 53 1 HP6606 HP50 76 0 HP40 19 0 HP51 22 1 HP5715 HP61 60 0 HP62 1 0 HT93 15 1 HT9437 HT94 8 0 HU06 2 0 HU14 5 0 HU15 34 0 HU16 17 0 HU24 65 1 HU2543 HU25 95 1 HU2459 HU26 11 0 HU27 48 1 HU2874 HU28 49 0 HU30 5 0 HU31 52 1 HU3416 HU32 46 0 HU33 53 0 HU34 86 0 HU35 100 0 HU36 96 0 HU37 98 0 HU38 86 0 HU39 40 0 HU40 4 1 HU4108 HU41 16 0 HU42 53 0 HU43 65 0 HU44 91 0 HU45 95 0 HU46 97 0 HU47 86 0 HU48 69 0 HU49 56 0 HU53 16 2 HU5238, HU5538 HU54 22 0 HU55 15 0 HU56 54 0 HU57 21 0 HU58 47 0 HU59 85 0 HU66 12 0 HU67 15 0 HU68 17 0 HU69 47 0 HU77 2 0 HZ16 1 0 HZ17 3 0 HZ26 2 0 HZ27 15 0