This is a simple tool to convert between UTM or MTM and lat/lon, and
bring up the associated Google map from either.
The Google map and satellite images presented are reasonably
well positioned as far
as I can tell (to within 10 meters or so -- more below).
Note: mapping to Google only works with the WGS-84 ellipsoid!
Select the desired ellipsoid and traverse Mercator parms (orange area), fill in the appropriate fields of either first (pink area) or second (yellow area) group (xTM is UTM or MTM, as appropriate, zone letter not relevant for MTM), and click on the adjacent Calculate or Display button to convert and, optionally, display in selected system specified below (you can also select same or separate window).
More details below.
Aug 2006: added MTM for Québec (see caveats below).
Sep 2006: added the topo maps (via GPS Visualizer).
Jan 2010: added interface to Bing maps. May 2011: added interface to GeoHack (used by Wiki), which allows access to all sorts of other tools.
Apr 2014: revisited the GPS visualizer interface.