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No kidding ... its one of the "useful" kind which describes functions
by how to activate them in the menu (duh) but does not waste time
explaining what exactly it does and how it works .... who would want to
knwo that ?

I've had a Garmin 48 handheld for several years, and that unit will display
a "highway" page and tell me the crosstrack error. Its then a simple
matter to manually compensate your heading to offset the drift and/or
recover the original track, and the display continues to show your position
relative to the originally calculated track line.

When dealing with these manuals, it is well to remember that their aim is to
instruct on the operation of the unit, not to teach navigation.