It’s only when you use maps abroad that you fully appreciate just how good OS maps are. I did an adventure race in Costa Rica last year where the maps we were given were nearly 40 years old.
The age of the maps led to a few navigational issues, like when we were riding down a rural dirt road late one night. One of my team mates asked “what’s the next turn we’re looking out for?” Me (looking at the map): “we should reach a t-junction with another small dirt road, where we need to turn left”.
In another kilometer, our t-junction revealed itself when our dirt road ended abruptly on the side of a full-on, crash barriered, streetlit, blacktopped motorway. Ah. That probably wasn’t there when the map was drawn then….
Some teams reported finding whole towns that must have sprung up over the last 40 years that weren’t on the map! It makes the occasional whinge about OS maps seem fairly insignificant, really – “this field boundary isn’t shown as quite the right shape, etc etc”.