Hello Colin. My line is based on trust of the spatial alignment of aerial photo suppliers, who (recently) have proved to be remarkably good globally at getting pictures in the right position. I checked all four of them first. You trust someone else. How do you want to resolve this? - Craig Allan

Thanks for the interesting comments - if you could contact me on my user page we can chat at length about my approach. I assure you I am going slowly and carefully with the emphasis on maximum accuracy, using the actual treaty documentation. I am not interested in speed.
And don't believe Bing. Or Google. Or OSM. They all used inaccurate sources.

Thank you rorym, for noticing and repairing the errors - the power of crowd-sourcing is demonstrated again. I'm glad you were working in the area - Kenya is badly undermapped.

Perhaps its an Irish thing, but leaping into a discussion with a stranger by calling their work 'junk' is not constructive. It more like a good way to start a flame war or revive the 'troubles' online.
The little test strip is very useful to me in coding up map features in Kenya and Africa in general. As you only code Ireland you probably have no idea how unmapped Africa is and one problem is road hierarchies. What is a mere farm track in Ireland can be a tertiary road in county Lamu, Kenya. Should it be coded by function (Tertiary) or by appearance (Track)?
I will be in the Lamu archipelago next week Saturday. If that teeny tiny motorway isn't actually there I'll erase the feature.

Yes, I see that. Patching in a new piece led to accidentally damaging the relations. I am carefully adjusting the Kenya / Tanzania border and Kenya coast without ever breaking the line - I should have done that here ~~~~

Fixed. The original Anglo-German treaty that set the boundary during the Berlin Conference in 1884-1885 is not to be found online, so I used secondary data from the USA Department of State.