TomTom Navigator Navigator 4 Quick Start And User Manual page 43

Set the preferred units by tapping Set units .
This preference lets you specify how distances are expressed (in kilometres or in miles); how longitudes and latitudes are
displayed (using decimals or sexagesimals); and how times are displayed (using 24-hour format, or using the 12-hour am/pm
format).
decimal display sexagesimal display
(degrees, minutes and seconds)