If I may insert myself into the conversation. I looked at the opening_hours syntax recently when learning about parking specifications.

http://wiki.openstreetmap.org/wiki/Key:opening_hours#Syntax

Something like that could be used to specify different frequencies with time of year.

ferry:schedule:default:journeys=2/day
ferry:schedule:time_interval=Apr-Oct:journeys=4/day

I'm ad-libing over the following here:
http://wiki.openstreetmap.org/wiki/Key:parking:lane

Cheers,

Charles

On 10/04/2013 04:49 PM, Dudley Ibbett wrote:
One thing that you may also need to consider is that the timetables and therefore number of journeys a day may depend on the month as there are often summer and winter timetables.

Regards

Dudley

> Date: Fri, 4 Oct 2013 07:28:26 -0700
> From: rich...@systemed.net
> To: Tagging@openstreetmap.org
> Subject: Re: [Tagging] Ferry frequency
>
> Thanks all - some great suggestions. To clarify, I'm not looking to put
> detailed timetable information in (that properly belongs in a GTFS feed or > somesuch, not OSM), just a broad-brush indication to help routing engines.
>
> Based on Richard M's and Janko's suggestions, I'm tempted to use:
>
> journeys=4/hour
> journeys=2 or journeys=2/day
> journeys=on_demand
>
> to indicate, respectively, four journeys in each direction per day; two
> journeys in each direction per day; and the sort of ferry where you go to
> the bank, wave the ferryman down, and he comes to take you across.
>
> That avoids any confusion about "frequency" (a tram might have both
> meanings!) and is simple both for the mapper and for the consumer.
>
> I note there's also a reservation= tag
> (http://wiki.openstreetmap.org/wiki/Key:reservation) which will be useful
> for ferries where booking in advance is required.
>
> cheers
> Richard
>
>
>
>
>
> --
> View this message in context: http://gis.19327.n5.nabble.com/Ferry-frequency-tp5780010p5780141.html
> Sent from the Tagging mailing list archive at Nabble.com.
>
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