Homepage: http://www.geocities.com/user42_kevin/xtide/index.html
Author: Kevin Ryde
Updated:
XTide display in Emacs
M-x xtide displays a tide height graph in Emacs using the "tide" program from XTide (http://www.flaterco.com/xtide). M-x calendar is extended with a "T" key to display the tides for the selected day (like "S" does for sunrise/sunset). The graph is a PNG image if your display supports that, otherwise XTide's ascii-art fallback. Left and right arrow keys move forward or back in time. The various alternative displays from xtide like "p" plain times can be viewed too, see the mode help "C-h m" or the XTide menu for the possibilities. The location is taken from a customizable `xtide-location' variable, or if that's not set then from the XTIDE_DEFAULT_LOCATION environment variable which xtide uses. If neither is set then M-x xtide starts with the xtide-location-mode selector. The "l" key goes there too, to look at a different place. In the selector if you find a place close to what you want then try "d" to sort by distance for nearby places. If you've set `calendar-latitude' and `calendar-longitude' for your location then try "C-u d" to sort by distance from there.