So far this year, these are the top 5 selling GPS models for 2009:

1. Garmin nuvi 255W
2. Garmin nuvi 205
3. Garmin nuvi 205W
4. TomTom ONE 130
5. TomTom ONE 125

(Source: The NPD Group/Retail Tracking Service)

Nothing too shocking here. The less expensive, basic models sell the best, with Garmin taking the top 3 places.

I'm slightly surprised that Magellan's not in the top 5, since in many ways Magellan provides more features per dollar than Garmin or TomTom. Although given Magellan's lack of consistency in its product line and persistent customer service issues, it's not terribly surprising to see them lose market share.