Waypoints are 'Must do' points, avoidable only by cancellation, skipping or by some other deliberate act on the part of the GPS device's operator.
Shaping points, are just that. Points that have been used to shape a pre-planned route - most often created on a computer at home - in a definite direction down a definite road. They can be missed out at leisure, either by going off route deliberately or by accident, or by forcing a recalculation or in a number of different ways.
A properly run GPS, with a nicely created pre-planned route will always endevour to bring its owner back onto a pre-planned route for sure. Bods get mighty upset when their device doesn't.... See multiple threads on the topic.... The reasons for failure are many and varied but most often involve human error'on behalf of the operator.
Shaping points, are just that. Points that have been used to shape a pre-planned route - most often created on a computer at home - in a definite direction down a definite road. They can be missed out at leisure, either by going off route deliberately or by accident, or by forcing a recalculation or in a number of different ways.
A properly run GPS, with a nicely created pre-planned route will always endevour to bring its owner back onto a pre-planned route for sure. Bods get mighty upset when their device doesn't.... See multiple threads on the topic.... The reasons for failure are many and varied but most often involve human error'on behalf of the operator.