GPS tech (Garmin, Hammerhead, Wahoo, RWGPS, etc)

Spenceey - put your route into gpsies.com
save it then export it to a .tcx file and to your garmin (if you have the plugin)
alternatively copy that tcx file to your garmin\courses folder
on your garmin, goto training, courses - choose the course and select 'do course'
you'll then have a nice pink line to follow all the way to Dunwich.

This is what I did last year and it worked a treat.

EDIT: What he said ^ damn you TIM!

Thanks Clefty your a star. Just a side note though, would this work if I don't have any maps on the 705?