A Tk widget available from: http://cheshire.lib.berkeley.edu/mapwidget.html

[LV] so it appears that by ''map'', you mean a graphical display of geographic data.

[TR] - The map widget itself is inside the Chesire II package at ftp://cheshire.berkeley.edu/pub/cheshire/cheshire2.v2.35.tar.gz
This package also contains geodata that may be interesting for [Geographic mapping the Tcl way] or other [GIS] projects. For example, there is a file cities1 containing information in the form

 {GERMANY} {Berlin} {3060000} {13.4 52.51666}
 {USA} {Chicago} {3010000} {-87.6166 41.8833}
 {SOUTH AFRICA} {Cape Town} {860000} {18.41666 -33.91666}



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[[
[Category Package] based on [Tk] |
[Category Graphics] |
]]
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Another meaning of [map] is a classic primitive in [functional programming] - apply a function to all elements of a list:
 proc map {fun list} {
    set res {}
    foreach element $list {lappend res [$fun $element]}
    set res
 } ;# RS
 proc addTax x {expr {$x*1.16}}   
 % map addTax {1 10 5 2 1.95}
 1.16 11.6 5.8 2.32 2.262