Ray's Weekly Sports Electronics Mailbag

Hello, welcome to the Weekly Mailbag. I'm Ray, from DCRainmaker. com . If you've ever searched for reviews on sports technology - you've probably come across my site. I write about my triathlon/running training in general, along with sports technology and whatever else seems interesting to me. I started the Weekly Mailbag series earlier this spring as an opportunity to share some of the answers of the many e-mailed questions I get each week. "I've had my Edge 705 for about 2 years, and am very happy with it. However, I have a question. Do you believe the elevation gain measurements are accurate? There is a way to "enable" the elevation feature, I believe, from the internet. Is this more accurate than the Edge 705? I'm questioning it because a century I rode listed the elevation gained as substantially less than my 705. Maybe they used MapMyRide?" The Edge 705 , like all Garmin Edge units, uses a barometric altimeter, which means it's dependent on having an initial elevation be correct, and also dependent on correctly reading the barometric pressure. This is different from a GPS based altimeter, such as what's most common on the Garmin Forerunner line, which uses GPS location data combined with reference data about the earth's curvature to determine your elevation. The problem with GPS based elevation data is it can be less than accurate, at least in non-aviation and non-military grade equipment. By the same token, the Edge's barometric altimeter can also be temperamental. For example, if you have something otherwise stuck in the four little holes on the back, like water, it won't measure correctly. The 'elevation correction' feature that you see on Garmin Connect and other sites takes NASA elevation data that's mapped to the earth using lasers, and adjusts against that. It's not quite 100% perfect, but it's usually very accurate - often far more accurate that the Edge 705's unit. And about as accurate as you're going to get without scientific data out on the road itself measuring it (or known elevation points). **Update 6/6/11: I just received a note and call from the head of FINIS to let me know that indeed Aqua Pulse is not dead yet...but in fact, not actually out yet. They'll be launching the Aqua Pulse in the next few weeks. They'll also be updating their website shortly to include the product. In addition, they'll be sending me over a unit to try out.

Mio C310x 3.5-Inch Portable GPS Navigator Review | Cheap GPS ...

Some generalities one needs to realize concerning "ALL" GPS units. You will not find any GPS unit that is 100% accurate 100% of the time. You will find that "ALL" GPS units at one time or another will not always take the shortest route or fastest route no matter what you try. This is due to many reasons which include the number of satellites tracking you, weather, map accuracy, etc..,. I have heard often that to buy a unit using NavTeq mapping and avoid the TeleAtlas mapping. Personally, I have ran 2 different GPS units that used "current" NavTeq mapping and I was not impressed. Locally I would sometimes find myself being shown off road with no roads existing while the roads I were on were major secondary roads and had been there for 10+ years and then while driving several long trips on major highways, I would be shown as being off the interstate driving ? to ? mile off in the pasture somewhere. I have found just the opposite with the TeleNav mapping. I have run the TeleNav mapping in the same spots that I had trouble with the NavTeq mapping and I have not had one problem with its mapping navigation. Locally, the NavTeq mapping would sometimes only take me within 1/4 to 1/2 mile of my destination saying I was there when I wasn't. Not with the TeleAtlas, most of the time right on the money but has never been off more than 200 feet. Even running address look ups and points of interest in the demos at the stores, the NavTeq mapping did just not show updated information. Just the opposite with the demo of the TeleNav. "Personally", I like and support the TeleNav mapping over the NavTeq mapping, but please remember this is based on using the TeleNav mapping only with the Mio C310X with the note that this GPS unit comes with the most up to date mapping available (Aug 2006) to this date. You will find that the majority of GPS units in the GPS market are Garmin and Magellan units. "Personally", I do not like the interface of the Garmin GPS units. In general, the public has Magellan units rated less "overall" compared to Garmin units plus Magellan is known not to have good customer service. "Personally" I do not know but that is the general consensus you will find when one researches. There are many brands out there now which are trying to compete with Garmin and Magellan GPS units. Some are rated pretty good and some are rated quite average or below.

HDCSXL: Extra Large Hard Shell Case For Garmin, TomTom, Mio GPS with 4.3″ Screen Reviews

HDCSXL: Extra Large Hard Shell Case For Garmin, TomTom, Mio GPS with 4.3″ Screen Reviews

HDCSXL: Extra Large Hard Shell Case For Garmin, TomTom, Mio GPS with 4.3″ Screen Reviews

HDCSXL: Extra Large Hard Shell Case For Garmin, TomTom, Mio GPS with 4.3″ Screen Reviews

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