hey retro?GPS units.?i was looking down into a car from a truck a few weeks ago in surfers watching some tourists fumbling with theirs,were going about 5 or ten kays through traffic,the driver has the instruction book in one hand and with the other is pressing buttons as is the passenger,just beautiful.that old truck had a great long pair of air horns but i thought i better not blow them between the buildings!its probably best to take all the advice about anticipation and avoid #$%*e if you can,punch ups are too easy to get into anyway.i just blow the horn when needed and move on,a decent sounding horn on a bike commands more respect than a meep/meep one,i have a pair of narva "fanfare"horns which fitted nicley in the original spot.