Convert from exameter to chain [Ramsden, engineer]

Unit Definition (exameter)
An exametre (American spelling: exameter, symbol: Em) is a unit of length equal to 1018 metres.

Unit Definition (chain [Ramsden, engineer])
The Ramsden chain is quite different to the Gunter chain. The Ramsden chain was commonly used by American surveyors. It equals approximately 100 feet and is also known as the engineer's chain.