Spaced-OoooO-Out ::

The Ordnance Survey have always maintained the trig point and benchmark network for those carrying out traditional ground surveys (leveling and or detail survey). In the past, if you wanted access to the precise co-ordinates of these locations you needed to purchase. With the advent of OS’s use of GPS and active/passive differential GPS network, trig points/benchmarks are either disused or dismantled. Whilst many liked the old survey network, it was expensive to maintain and so something had to give. However the good news is that all the (unmaintained) data is now free to use. Just go to the OS Benchmarks & Trig Archive and browse to your hearts content!