Route Card 11 - Size Matters

Part 1

Start at SH68 and proceed via 144 127 279 209 155 112 171 148 156 to finish at 133.

Route Checks
1) T 5
2) RRY 6
3) ^ 6
4) Ch+ 6
5) YYW 7/9 4424(1), 4425(2), 4426(1), 4724(1), 4823/4923(2?), 4919/5019(2)

Part 2

Continue via

Finish at last plot.

You needed to examine or download the squares and find their size in pixels which gave the following spot heights:
101 58 74 87 46 75 36 78 96 65 77 103 98 107 104 84 122 119 104 72
The road colour was an additional clue.

Route Checks
6) ETL 6
7) J-S GGY
8) T 3
9) GGY 5
10) Br 2