Can I use Molodensky or 7 parameter transformation instead of NTv2?
The NTv2 transformation method is the simplest and most accurate and for consistency should be used in preference to less accurate methods. Other methods, such as the Molodensky or 7 parameter transformation, can be used if it is not possible use NTv2 (e.g. transformation in a hand-held GPS receiver) provided the accuracy limitations are understood and where appropriate they are included in the meta-data.
