This seems a good place to use the hazard key. There are a limited number of 
instances of hazard=tide.
There's no reason why post-processing cannot append information about critical 
hazards to names for rendering purposes, and thus we could avoid the spurious 
information in the name tag.

      From: Graeme Fitzpatrick <>
 To: "Tag discussion, strategy and related tools" <> 
 Sent: Sunday, 5 November 2017, 6:58
 Subject: Re: [Tagging] passage only on low tide

On 5 November 2017 at 13:46, Max <> wrote:

I went with


not sure how to say that the passable time frame is about 3 hours (with climate 
change it's getting shorter)..

How about Description: "Only passable 1.5 hours each side of low tide - check 
daily tide times", possibly with a link to online tide info?  
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