An ordnance survey map of an area can be located by going to the OS website. They provide various tools that allow people to find which map they want and which scale of detail they want. The maps are sold online directly or through many newsagents.
help you when you lost
OS is Ordinance Survey in geography.
contour lines
see ebay
Post Office
a triangle with this sign ~ stuck on top of it
elephant
it's a place for helicopters to land.
Youth Hostel
The Ordinance Survey is the official map-making body of the British government.
I wonder, which map the question originator is looking at? On Ordnance Survey maps symbol guides, there is no RED STAR. There is however a blue star meaning: Other Tourist Feature.
The result of the Land Ordinance of 1878 was the expansion of the US up to the Mississippi River. This would lead to colonization and state creations, making another place for American Settlers to move to.