Thanks for your post and please find comments -
There are no Motorcyle helmets available that have been approved by B.S.I to B.S.I PAS:028 2002.
The criteria that PAS:028 1998 conforms to that others don`t is with respect to the Marine Safety Helmet Approval Specification.
The RNLI have the new helmet under trial.
Whiplash is a consideration at any speed in any fast craft.
A Gecko helmet from a thermal point of view will offer more insulation than a normal motorcylce helmet when either is being used wet.
A motor cycle helmet will offer greater impact protection, but due to the larger size and weight increases the risk of whiplash and neck fatigue is increased. Part of the PAS:028 requirement is for the helmet to float after being submerged for 24hrs, which it does.
The standard PAS:028 is a standard required by B.S.I and not Gecko / R.N.L.I
Any helmet not fully meeting the current B.S.I PAS:028, should really not be recommended for Marine Safety helmet use.
The standard is a several page document and we recommend that you contact B.S.I product services to obtain a copy.
We are not in a position to comment on behalf on B.S.I and again recommend that you contact them direct for such.
The MK10 halmet is currently on trial with various Police forces / departments.
Hope the above helps and kind regards
Gecko Head Gear Ltd