New Garmin GPS

Discussion in 'Touring and Adventure Cycling' started by john59, 1 Sep 2007.

  1. john59

    john59 Guru

  2. Mister Paul

    Mister Paul Legendary Member

    It does. BR are raving about it.

    But have you seen the price?? Even buying it from the States is expensive.
  3. redfox

    redfox New Member

    Bourne End, UK
    Nah, it uses a built-in battery, so its not ideal for touring. Why cant they stick with AAs?
  4. Brock

    Brock Senior Member

    That's not for touring. That's for race training surely.
  5. redfox

    redfox New Member

    Bourne End, UK
    Maybe, but as this was posted in the touring board I thought it fair to point out the touring limitations. I would still want to be able to carry spare batteries even on a day ride.

    Anyway, for $500 (so presumably around £500 over here) it should do everything!
  6. Brock

    Brock Senior Member

    Sure redfox, I wasn't criticising your criticism honest! Just agreeing with it really.
    It would be lovely to see a GPS designed specifically for cycle tourers, but that definitely isn't it. :ohmy:
  7. redfox

    redfox New Member

    Bourne End, UK
    Oops, on re-reading my post, that did come off as a bit harsh. Not my intention at all, sorry Brock. :ohmy:
  8. Road Fiddler

    Road Fiddler New Member

    Its not uncommon for people in out of the way places to use rechargeable GPSs, Laptops and Sat phones with just the aid of Silva roll up solar panel. There is no reason why they could not be used on the bike (other than cost), in fact i think they would be perfect.

    I am amazed no one has come up with an on bike charger quite honestly. Has no one producing hub/bottle dynamos chargers. I know Motorola and Ipod have there on bike chargers.
  9. Brock

    Brock Senior Member

    That one looks interesting.
  10. Road Fiddler

    Road Fiddler New Member

    I thought someone must have come up with the idea already
  11. HJ

    HJ Cycling in Scotland

    Auld Reekie
    The Edge 705 with Heart Rate Monitor is expected to be available in December 2007 and have an estimated retail price of £329.99 / €499.99. Not sure if it is going to be on my Christmas list though.
  12. Andy in Sig

    Andy in Sig Vice President in Exile

    My bottom line on this would be, can you get 1:50,000 mapping for anywhere in Europe for it?
  13. twowheelsgood

    twowheelsgood Senior Member

    Zurich Switzerland
    PLEASE garmin, don't cock this one up like you did the others in the Edge series.

    Give us back our map datums!!!!!!
  14. andrew_s

    andrew_s Veteran

    No, it will use Garmin Mapsource data just like all the others.

    Garmins display vector data - lines joining positions defined by coordinates.
    1:50,000 data like memorymap is raster, which is a picture just like a photograph or a scan of a paper map.
    Raster maps just aren't suitable for use on a GPS that may be required to hold data for large areas and be displayed at a wide range of scales

    Vector data can be drawn at any size without loss of information.
    The only limiting factor is that things get too small and crowded together if you display too large an area on a small screen. This can be overcome by turning off irrelevant detail, so you don't have residential roads and small lanes shown when you are looking at a scale suitable for planning a route between towns.

    Raster data is just coloured pixels, lines only existing as pixels of the same colour next to each other. You can see all the information at a zoomed in level, but as you zoom out you end up trying to fit several map pixels onto one screen pixel. All you can do to decide what to show is to look at the colours of the (eg 4) pixels that make up the single screen pixel, so if 2 are blue and 2 are white, you pick blue, but if 1 is blue and 3 are white, you pick white. Once you've zoomed out too many times, the white background ends up dominating and lines break up.
    Looking at MemoryMap on my PC, at maximum zoom 1 screen pixel = 1 image pixel, and is 5mx5m on the ground, with the 1km grid lines appearing about 10cm apart. Each time I zoom out, 4 pixels are merged into one and the apparent distance between grid lines is halved, with 5 zoom steps until the grid lines are about 3mm apart. By this time anything that was originally narrower than an A road (16 pixels wide) has pretty much disappeared.
    Using MemoryMap, you just switch over to a separate set of maps (1:250,000).

    To view raster data usefully at the same range of scales that you see on a GPS, you would need about 4 separate sets of maps - eg 1:625,000, 1:250,000, 1:50,000 and either 1:10,000 or possibly 1:25,000 (based on OS scales). A 20x20km jpeg of 1:50,000 is about 7 Mb, 10Mb if you store the pyramids for multi-resolution display (4 pix -> 1) rather than trying to do it on the fly. 1:25,000 will be 4x that per sq km. If you start adding up what's required, you end up with about 1.25 GB for a 100km x 100km area, which is about the smallest area that would be useful for cycling.
    Contrast that to the Garmin vector data, where you can get the whole of western Europe in the same amount of storage.
  15. Why isnt' it ideal for touring? I've got an Edge 305 and the charger for it weighs nothing and takes up hardly any space. If you're going somewhere without plugs you can now buy USB chargers which run on AA batteries so the built in battery isn't an inherent limitation...
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