Andy Howell said:Quoted message said:My question - is this sort of detail dependant on the GPS
maps you buy, or the GPS itself? If it's the maps, which
GPS maps include actual topographic details for the UK?
Am in the same situation but spent a fair amount of time
at the Outdoor Show yesterday understanding all of this.
Magellan - with their Sport Trak Colour - can download
OS maps.
No they can't, at least not in the sense that we currently
understand the phrase "downloading an OS map". GPS units use
vector information whereas map downloads are bitmap files.
GPS units can't load bitmaps.
The SporTrak Color is no different to other mapping GPS
units other than the fact that it shows info in different
colours, but the info shown is basically just a roadmap. ht-
tp://www.magellangps.com/en/products/product.asp?PRODID=918
Are you sure you weren't confusing it with something else,
like a pocket PC connected to a SporTrak? Programs like
Anquet and MM run on Pocket PCs and can be run in
conjunction with a GPS. This is the only method I currently
know of which enables you to use OS mapping with a GPS.
Quoted message said:These show much of what you would expect on an OS map.
Much of? So not the same as an OS map then? It is
theoretically possible that the unit could download vector
OS data but I wasn't aware that the OS were licencing that
data to GPS manufacturers. Perhaps this is a welcome new
development? I hope so.
Currently the only GPS topographical data available is for
North America only, and can be used by all the Magellan map
models, not just the SporTrak Color. magellangps-magellangps-Open ↗
.com/en/products/product.asp?PRODID=113
Garmin also has 24k topo data, again for the US only. As you
can see from the screenshots at the bottom of the page, what
you see on the GPS screen is somewhat simpler than the full
map that you see on the PC screen. Still excellent for a GPS
though.
garmin.comtopo24knp.jspOpen ↗
Quoted message said:How useable this is when you are on the mountain I'm not
so sure but the display quality was better than I
expected.
Given that non-mapping GPS units are highly usable then it
will undoubtedly be extremely useable. Any topographical
data will be a big help.
Quoted message said:At £240 this seemed to represent reasonable value
for money.
How cheap? GPS Warehouse lists it at £295 including VAT,
reduced from an RRP of £375.
gpsw.co.ukprod1368.htmlOpen ↗
Quoted message said:With the Garmin line you will probably have to look to the
new (and very expensive) models which have colour screens.
These screens are impressive although there are non in the
shops at the moment and retailers told me at the show that
they had heard that there were problems with the display!
Yes, they look great, first colour models with 256 colours.
garmin.comgpsmap60csOpen ↗
Quoted message said:But, as yet, Garmin do not have access to OS data although
they say that this is coming soon
Really? Good news if this is true.
Quoted message said:- they claimed they were working on translating OS data to
Garmin format which seemed a bit odd to me.
Not at all. It's vector data, not bitmap. All GPS
manufacturers have their own format. The advantage of vector
data is that it can be zoomed in and out without loss of
resolution, unlike a bitmap which pixellates when you zoom
in. The problem is that as you zoom out there's too much
information on the screen so details have to be filtered
out. So for example with a road map, if you zoom out you'd
only be able to see the major roads, but if you zoom in
you'd see all the side streets. They'd have to do the same
with the topo data, when you zoom out they'd have to filter
out contour lines, minor rivers etc. The maps need to be
useable at all the different zoom levels.
Quoted message said:So - at the moment - I think you would need the colour
display Magellan which does look reasonable value for
money at the moment. Expect to pay another £100 for the OS
CD data but you can probably buy this separately.
What? Only £100? For the whole UK? Only if the data is
simplified considerably. The bitmap data from Anquet or MM
costs at least double that.
Quoted message said:I must admit I didn't find either company particularly
helpful. I would have bought one but neither company could
really tell me how to interface with a Mac - Magellan
telling me that this wouldn't work.
Computer support for GPS is actually quite limited. Lowrance
won't work with Anquet for example. They only recently added
support for Magellan. Garmin is the most widely supported.
Paul
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wilderness-wales.co.ukwilderness-wales.co.ukOpen ↗
wildwales.fsnet.co.ukwildwales.fsnet.co.ukOpen ↗
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