\mode<presentation>

\setbeamertemplate{itemize item}{\color{navyblue}$\blacktriangleright$}
\setbeamertemplate{itemize subitem}{\color{navyblue}$\blacktriangleright$}
\setbeamertemplate{itemize subsubitem}{\color{navyblue}$\blacktriangleright$}
\setbeamertemplate{items}[]

\mode<all>