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We construct coordinate systems that cover all of the Reissner-Nordstroemsolution with m>|q| and m=|q|, respectively. This is possible by means ofelementary analytical functions. The limit of vanishing charge q provides analternative to Kruskal which, to our mind, is more explicit and simpler. Themain tool for finding these global charts is the description of highlysymmetrical metrics by two-dimensional actions. Careful gauge fixing yieldsglobal representatives of the two-dimensional theory that can be rewritteneasily as the corresponding four-dimensional line elements.

Explicit global coordinates for Schwarzschild and Reissner - Nordstrøm solutions