\documentclass[]{article}%

\usepackage{gcheck}

\usepackage[a5paper, papersize={14cm,20cm},
 landscape, margin=1in]{geometry}
\geometry{portrait,landscape}
\geometry{dvips,showframe}

\begin{document}

\typeout{}
\dcheck\paperwidth{569.05511pt}
\dcheck\paperheight{398.33858pt}
\dcheck\textwidth{424.51514pt}
\dcheck\textheight{253.7986pt}
\dcheck\oddsidemargin{0pt}
\dcheck\evensidemargin{0pt}
\dcheck\topmargin{-37.0pt}
\dcheck\headheight{12pt}
\dcheck\headsep{25pt}
\dcheck\footskip{30pt}
\dcheck\marginparwidth{65pt}
\dcheck\marginparsep{11pt}
\dcheck\columnsep{10pt}
\dcheck\hoffset{0pt}
\dcheck\voffset{0pt}
\ccheck\mag{1000}
\checkresults
\typeout{}

\manyfoxes
\end{document}