Hi HJ,
Do you "really need" a snorkel? Yes absolutely but it's very easy to test this out yourself on this Bahamas trip - bring your snorkel on the boat and do a few dives without it. You will quickly realize the benefits of just keeping your face in the water.
As far as the vibrations - yes this could have something to do with the type of keeper you have and a old fashioned figure 8 keeper spread nicely on the snorkel tube could help. What can also help is where you position the keeper on the strap - a lot of newbies tend to position the snorkel tube closer to the mask whereas the ideal position is actually much further back - actually as far back on the strap as you can comfortably get it - this will probably help reduce the vibrations.
- Robbert
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