After a day of rest in Haarlem we just finished our fourth stage and arrived ind Santpoort-Noord. Another 22 km. Sun is burning down relentlessly.
By the way we navigate safely with the app OsmAnd+ which is an open source navigation app using the map material of open street maps. Working great so far. It can evem use GPX files.
The app is available in the F-Droid app store.