Global Mapper v24.0

Which Datum to use for British Grid

Blooper
Blooper Global Mapper User
Could someone advise me on the best settings for working with British OS vector drawings please? I usually work in Northern Ireland and just wanted to be sure I'm setting things up correctly. I know I need British Grid projection and OSGB36 datum but there are 3 OSGB36 options as below OSGB36 (7-PARAM TRANSFORM) OSGB36 (BEST TRANSFORM) - NTv2 Grid OSGB36 (NTv2 Grid) - NTv2 Grid Would appreciate if someone could confirm which is best for me. Thanks.
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