qgis - Convert vector points to GPS waypoints and route

I have a shapefile with a series of points (around 300) using British National Grid. I need to put them on my Garmin Etrex 10 as waypoints.

Can someone tell me how to convert this shapefile into GPX data?

It may also be helpful to know how to make this into a route. The points are named 1 to 300 and would be visited in that order.