Does it cost to have the GPS service or do i pay only for the device?

GARMIN NUVI 760 AUTO CAR GPS NAVIGATION 4.3 WIDESCREEN

$139.99

GARMIN NUVI 760 CAR GPS NAVIGATION + DASH MOUNT

$146.99

GARMIN NUVI 255 PORTABLE CAR GPS NAVIGATION SYSTEM

$94.90

GARMIN NUVI 265T CAR/AUTO GPS NAVIGATION 2010 MAPS 265

$99.77

garmin 010 10817 weather

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Garmin Nuvi 360 Personal Travel Assistant

Garmin [...]