While I agree that this is really up to the game, the gm and the players, I think long distance travel in the Astral is a bit different from a SS driving his bike through the street.
I think Astral travel for a short distance should be reletively simple, the fact that a mage can travel long distances at the speed of thought can complicate things.
A city, specially the Seattle Metroplex, is a big place. Travelling from Fort Worth to Tacoma should be a bit of a challenge without a map. A SS can consult street signs, his GPS, Grid Guide, whatever, to find a particular unit, in a particular building, in a particular street in a particular neighbourhood in a particular district (and so forth). But a mage whose never been there before? With out any maps (unless they memorise it and can match astral imagery to real world landmarks)... how to the find Bradley Lane, of Landfall Crecent, in Daisy Park, etc etc. I think its a challenge.
That said, it depends on the GM and the game. In my games, mages use Astral to scout locations, usually leaving their body with their buds in a nearby car. Alternatively, they use ritual magic to track a person down accross long distances... but they are using a material link, not a street map.
If Mages started flying accross the city without a material link etc... I would start asking them to check if they get lost. The city is a big place to travel without some form a guide...