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Old 03-23-10, 11:51 AM   #1
Sardian
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Garmin 705 Edge, Maps

I'm about to order a Garmin 705 Edge GPS unit.

I see that some sellers sell the unit with a "Base Map". Is this all I really need if I already have a micro SD card to put in the unit or do I need more detailed maps to use it correctly?

Thanks
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Old 03-23-10, 12:12 PM   #2
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You absolutely need the detailed maps to use the device- the basemaps are utterly and completely worthless unless you like to ride on freeways. Unless you have the detailed maps the SD card really isn't needed since you can't play music etc on it and there's already a substantial amount of internal memory.
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Old 03-23-10, 12:23 PM   #3
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The 705 will work "correctly" without any extra maps, in the sense that the GPS function will still work, all the speed/cadence/heart rate/etc. readouts will still work, and it will still track your route, etc.

But as was mentioned, if you want navigation, the base map is pretty useless. I feel the best option is to get the Edge 705 bundle without maps, then go out and buy the City Navigator DVD separately along with a cheap 2GB SD card. This is a bit more complicated, but the DVD version of City Navigator allows you to install the maps both on the Edge and also on your PC. You can then use your PC to plan routes and upload them to the Edge (via the Garmin MapSource application). If you just get the version that comes on an SD card, I don't think you can transfer the maps to a computer.
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Old 03-24-10, 11:55 PM   #4
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The City Navigator maps don't all quite fit on a 2gb card. The 705 is no longer limited to 2gb cards as it as, so probably better to get a 4gb card and download all the maps to it. I doubt you'd need (or use) all the maps in City Nav, but my inner Monk likes to be complete.
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Old 03-25-10, 08:37 AM   #5
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2gb is probably plenty for a city. I have an old etrex that only has 24 megs internal memory. I have street level maps for close to half of Florida on that thing. This was data from the old mapsource cd, but I would not think that matters. A blank DVD holds something like 4 gigs of data (unless it is dual layer in which it holds close to 9 gigs) so a 2 gig SD card will hold a little less than 1/2 the data on that Garmin DVD - assuming the DVD is 100% full. If the Garmin DVD is only 80% full, a 2GB card will hold over 1/2 the data.

So unless you plan to ride from Key West to Seattle, you will have enough capacity.

On the other hand, I found 4 GB micro sd cards at Target for $10. So you do not really save much with a 2 gb card money wise.

I also have a Magellan car gps. The largest data card it will take is 2 gb, and there is no internal memory. It has street level maps for the entire USA on that one card. This includes points of interest and all.

The point is if I already had a 2 gig sd card from an older device, I would just use that in my Garmin bike computer. If I had to buy a card, then I would get the least expensive card I can find. You don't really need a lot for map data
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Old 03-28-10, 04:55 PM   #6
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I just took delivery on an Edge 705 yesterday. It's maps cover all of North America including Canada and Alaska. In fact, for exercise, I set up a route from Colorado to Alaska, a route I've driven. It gave me a route that matched what I had driven.

All the maps are on a 2Gb micro-sd card that came with the unit.

My problem is that I can't figure out how to make it give a correct altitude. Nor, does the manual or web site help. Right now it is off by about 1200'
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Old 03-29-10, 06:17 AM   #7
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Thanks for all the help.
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Old 03-29-10, 06:39 AM   #8
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Quote:
Originally Posted by Latitude65 View Post
My problem is that I can't figure out how to make it give a correct altitude. Nor, does the manual or web site help. Right now it is off by about 1200'
Unlike many of Garmin's handheld GPS'es, as far as I know there's no way to calibrate the altimeter on the Edge. It should settle down to something reasonable after a while, but IME it is never all that accurate for absolute elevation. If it doesn't correct itself after a few hours, there could be something wrong with the barometer that is confusing it. Maybe one of the vent holes in the back is blocked.
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Old 03-30-10, 01:15 PM   #9
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Originally Posted by Metaluna View Post
Unlike many of Garmin's handheld GPS'es, as far as I know there's no way to calibrate the altimeter on the Edge. It should settle down to something reasonable after a while, but IME it is never all that accurate for absolute elevation. If it doesn't correct itself after a few hours, there could be something wrong with the barometer that is confusing it. Maybe one of the vent holes in the back is blocked.
See the posts in the 705 Tips thread.
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