On Mar 17, 8:24 am, Chuck Cox wrote:
... a marine weather browser that would overlay
(free) graphical weather data on (free) marine charts. ...

Having "helped" a number of cruisers with wx routing I think you could
be onto something. Individual users can use MaxSea or similar but
there are some limitations: 1) it's brutally expensive 2) it will not
show some wx info from gribs particularly 6hr precipitation rate which
is quite useful 3) it's not on the web. Adding calculations for the
sailings (code was recently posted here as the aviation fomulary)
would be nice. On the wx side you should be able to choose the global
model (GFS and NOGAPS are available world wide), and at the very least
show 10 meter winds, isobars and 6hr precip. rate. Other model data
that's available but not as critical includes: wave height and
direction, surface temperature (weekly), surface current (weekly) and
quicksat wind. Actual routing is very hard to get right, but some
kind of DR advance along the GC and RL would make interpretation
easier.

-- Tom.