We use a hand held on a knee board for night flying in the squirrel. It is a very useful piece of kit with MSA , pylons etc all ata a glance. Much better than the old skymap 111 which regularly seems to not know the name of any local town/village for referance...and when it does , it is often a name which is not on the caa map !! Thinking now of fitting one in permanent . Also displays notams etc