Work harder or work smarter--I guess it is your call!! Me, I like to work smarter, and 1/2 hour of overtime pays for the map.
TSG, I would think that the only way that a portable GPS device would be beneficial is if you kept in on the mode that shows a map and then move the area of the map that is displayed as you progress throughout your day. That is just my opinion and, to be honest, I am not all that familiar with those devices. I have only used one once, when my son, mother-in-law and I were driving to my daughter's college graduation in my MILs car and she had a Garmin. The directions suggested were not the ones that I ultimately chose to use but I also didn't realize that it flashed your speed on the display until the MIL leaned over and asked why I was driving her car 81mph--oops!!
On a side note, is it just me or has anyone else thought that Garmin should add regional dialects/slang to their GPS devices. For example, units sold in Texas would have a cowboy, units in LA would have a Paris Hilton wannabe, and units in NYC would have a foreign cabbie. I also heard that Garmin wanted to sponsor a NASCAR car but the driver refused because during practice runs all he heard was "Turn left, go 200 yards, turn left, go 200 yards, turn left..."