What about something similar to the 'baby on board' car signs with the sticky plunger thingie on, that can be taken off when not at dive sites?
I'd have one of those! (Not many people would see mine though
)
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Sue
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"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, chocolate in one hand, red wine in the other, body thoroughly used up, totally worn out and screaming ~ "WOO HOO what a ride!"
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The Blonde Mediterranean Mafia
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Utina - Gozo