Can I submit a confluence without using a GPS receiver, but a good map instead ?
The GPS receiver is not required, although it helps a lot to pinpoint the exact location. If you do not have a GPS and cannot borrow one, make sure you have a very detailed map of the area, a good compass, and good navigation skills. Satellite photos available from terraserver may help locate the right spot in this case. Remember – the rules of the project require you to be within 100m of the confluence point.