is the place to start looking for Chilean info. They may have something that can be used with openCPN
In Rio de la Plata the sea level is influenced to a truly remarkable degree by the weather/wind. I don't think I ever used tide tables there.
South of the Brazil/Uruguay border there is the north going Falklands Current
which runs inshore of the prevailing south going circulation (Brazil Current
As stated there are big tidal ranges along the Argentinian Patagonian coast which have quite an effect a considerable distance offshore
from the major headlands and can lead to very nasty wind
over tide conditions.
It is not a good idea to consider entering Magallanes from the east. Considerable tidal streams, no shelter, and prevailing strong westerlies... and thats before you get to the narrows.
Once into the Beagle and heading up the channels the tides are only critical in a few places. Canal Barbara I have never been through and can't help with. Ackwalnisan I shall post shortly when I get back to the boat ( you need to know the tide at P Arenas.) Canal Chacao is 'interesting'.
The rest is straight forward.
As mentioned above the range gets quite large north of Boca de Guafo, south of there it is in the order of a few metres and the vast majority of the anchorages
I carry the hard copy Chilean tables... me being old fashioned and all.