labbook figure numbering

Question

I am using the labbook document class which is based on scrbook. labbook doesn't number the chapters, but the figure numbering still behaves the way it was in scrbook: it's not running, but each chapter starts with "Figure 1". I tried

\usepackage{chngcntr}
\counterwithout{figure}{addchap}

but I get the error that addchap is not a counter (which absolutely makes sense). How can I get running figure numbering throughout the document?

MWE:

\documentclass[oneside]{labbook}
\usepackage[]{graphicx} 
\begin{document}

\labday{Monday}

\begin{figure}
\centering
\includegraphics{Figure1.jpg}
\caption{Figure1}
\label{fig:Figure1}
\end{figure}

\labday{Tuesday}

\begin{figure}
\centering
\includegraphics{Figure2.jpg}
\caption{Figure2}
\label{fig:Figure2}
\end{figure}

\end{document}

Answer 1

The figure counter is tied to the labday counter (while \addchap is the macro used to add another \labday and therefore does not constitute a counter). So, using

\usepackage{chngcntr}% http://ctan.org/pkg/chngcntr
\counterwithout{figure}{labday}

provides running figures from labday to labday.