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My Garmin Nuvi 660 now only provides street routes to destinations. It won't provide routes over freeways. I tried resetting the device, but it still calculates the routes over streets.
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The Street Pilot line was one of the first automotive GPS devices from Garmin, and has got to be 8+ years old. Garmin contracts with Navteq for map software. At one point, Garmin needed to have Navteq compress their new maps so that they wouldn't need to increase the amount of memory in the GPS units and still be able to include all the way points, and new features such as junction view, traffic receivers, text to speech voices, etc. These new maps have an "NT" descriptor in the title. "NT "stands for "New Technology". Non-NT maps are no longer produced.
The new Garmin GPS hardware had to included the ability to decompress maps "on the fly" for display on the screen. As a result, the NT maps will not work in the older Garmin devices.
Your best bet is to either use the Street Pilot - knowing that the routes may no longer provide accurate information, or purchase a New, Refurbished or Used GPS. Garmin offers "Lifetime Maps" as an option for nearly all NT capable GPS units either as a subscription after GPS purchase, or "in the box" when buying a Garmin GPS. You'll get FREE map updates for that GPS up to 4 times per year. This assures you of always having the most recent maps available in your GPS. Look for a model that has "LM" in it (ie: nuvi 1490LM). If it has a "T" in the model name (ie: nuvi 1490T), it has Lifetime Traffic. If it is listed as "LMT" (nuvi 1490LMT) it has both Lifetime Maps and Lifetime Traffic.
Routes can be edited to add or remove points by selecting the route and editing it while in the nuvi. This can be done by going into the Tools > Routes, select the route and Edit then save. The route can also be edited by using the Where To? > Routes, select the route and Edit then save.
What you're looking for is called "Via Points" as your friend correctly suggested. From the Garmin Nuvi 750 web based information:
nüvi 750 includes advanced navigational features to take the worry out
of traveling. With route planning you can save 10 routes, specify via
points and preview simulated turns on the 750's wide screen. In
addition, nüvi 750 automatically sorts multiple destinations to provide
an efficient route for errands, deliveries or sales calls.
"Alternate routes" are those routes that are created when the nuvi is used with a traffic receiver (FM or MSDN). This allows for a new route to be created with the traffic data so that routes suffering congestion, etc. are avoided. Some people also refer to the routes created when a turn is missed (the GPS indicates "Recalculating") as an "alternate route" but it is not.
This series of Nuvi has 2 sets of voices for several of the available languages. The standard set is pre-recorded words linked together to form directions. This voice is usually clearer. However you lose street names and expanded vocabulary. The Text-To-Speech (TTS) voices are reading letters to form words, and uses an algorithm to come up with the approximate pronunciation of the word. This may sound less clear, but provides street names. So, you can select a standard voice (settings-locale-voice language) and lose some functionality, or select one of the many TTS voices and try to find one that doesn't offend the ear.
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