To compensate for this in the past, I used online mapping services to try and chart directions before leaving home. Inevitably the plans would change, Id leave the printed maps in the last rental car, etc.
After much internal debate, I finally decided to purchase my own global positioning satellite (GPS) receiver to improve my efficiency.
My requirements were for the new GPS receiver seemed straightforward. The new unit had to be small and very portable but also with a large-enough color screen that could be read while driving. It needed an accurate U.S. roadway map and have a means to be expanded or upgraded with new data, plus it had to support both an internal rechargeable battery and 12-volt car power.
While researching, it quickly became apparent that the challenge would be due not to the limited number of choices, but instead in selecting the correct unit, as there very many different vendors and models.
(As an aside, one legal issue I encountered is that the states of California and Minnesota do not allow suction cup mounts for anything on windshields. Many GPS vendors offer alternative mounting methods ranging from permanent to portable and this legislation was definitely something to bear in mind.)
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As with many projects these days, the research began by using Google and searching for product reviews, user opinions and so on. I quickly ruled out units with monochrome screens as too hard to read and further re-affirmed my need for a color display. While browsing the web and local electronics stores, two different markets became readily apparent - units that would only work in a car due to needing to plug-in to the cigarette lighter and portable units really aimed at hikers or infrequent users. My goal was to try and find a GPS that bridged those groups.
Customer Service Counts
Reports on reliability and how well the firms handled customer service factored heavily into my decision-making process. Its pretty much a given that electronic devices will have problems for one reason or another. How a vendor treats customers and handles issues can make or break a purchase and some vendors were quickly eliminated using that criterion.
After digging for several days, I selected the Garmin Nüvi 350 for my use. With a suggested retail of $857, the price seemed steep, but I quickly found out that Amazon sells the units for $609.95, which is a steep discount.
Regardless of which vendor you buy your unit from, please heed one piece of advice -- use the Garmin website to understand accessories and only then purchase what you need. Resellers dont always do a good job of explaining dependencies. For example, I needed a specific mounting head to use the friction mount I selected to use in cars. I didnt realize the dependency until after the first piece arrived and then I had to place another order and wait for it to be delivered.
From a technical perspective, the Nüvi 350 supports a GPS-based location resolution of less than 10 meters, and with Wide Area Augmentation System (WAAS) enablement it improves to less than 5 meters. The exact accuracy will depend on the number of satellites the receiver can lock on to plus errors introduced by atmospheric interference, receiver clock discrepancies, angle to the satellite, and signal bouncing off objects. I found the internal antenna to be surprisingly sensitive. When others lose signal, the Nüvi frequently can maintain a connection. With that said, being well inside a building definitely blocks connectivity.
From a navigation perspective, the unit supports 400 waypoints and tracks trip information including odometer, timers, average and maximum speed plus estimated arrival time. Moreover, one feature I really like is that it can dynamically reroute to the destination. If I take a different route, then the unit continuously updates its suggested route to get you to your destination given then current location. This is great for missed turns or when just driving around looking at the vicinity of the destination.