No VOR or NDB kit so it's chart and permanent OHP pen. Do a PLOG, mark off 6 minute markers on the chart. Mark the wind speed and direction on the chart near to my track in case I need to divert.
Heading and stopwatch.
Backup is a handheld GPS on a flexi-mount with a route pre-programmed into it. Monitor actual against intended track on this and use it to identify my position on the chart. If it dies on me I know where I am and can carry on by eyeball.
Works for me.
Mike