inputs.text: disapointing product leader commercial trucking navigation software - trucking companies use alk pc miler basis tariff miles really expected alk unit used trip las vegas houston back calexico ca set freeway bias deviated onto secondary roads strongly tried get back freeways dehemanded uturns sharp left turns no road road calexico las vegas wanted go extra 150 miles freeway instead calculating major secondary road rand mcnally unit next recalculated used secondary road first five miles alk not finally accept secondary road 180 miles tripthe good news vendor diesel bosscom let return full refund toward rand mcnally tnd750 replace tnd520 definitely rate diesel boss five star