Bassrock

Mmmmmm Valid point, but, my "posh" Citroen has an athermic windscreen and my GPS works through that. Unless these train windows have a greater degree of athermiticity or its something else in the glass ?? Bassrock

Ok, Whilst on my way to a cache in deepest Lincolnshire, I took the opportunity to try out my GPS and TTM5. However, trouble with Virgin Voyager train heading south is that not even the tweeniest signal could I receive e.g. nothing, zilch, deed (guid scottish wurd). However, one train change later, tis a GNER train, hey presto were soon doing 125.2 mph and TTM5 is trying to jump the rails, signal lock is solid. So Anyone ever managed to obtain even the faintest of signals on a Virgin Voyager train. Me thinks the windows are different ??!! Bassrock

Mmmmmmmmmm 41 visits, 41 Mother in Law's !! Bassrock

Hello, Interesting post by Moot. If my BT GPS is bluetoothed to my PC and I fire up tomtom or GPXC or mapview on the phone they all respond by saying "unable to connect", but the minute I disconnect the link to the PC the phone connects no problem. I also get the same "scenario" if I connect the phone to the PC, I then cannot get the phone and BTGPS to connect to the PC at once. Now there may well be software that can play tricks with the COM ports, But I havent found any (YET) working onit. Regards Bassrock

Hello, Currently not aware of any that do just that. I run visual GPS and tweak the NMEA occasionally but at the same time I would like to run TTM5 and mapviewGPS in order to asses whats happening on the Visual GPS software at the same time as analysing whats happening with the tomtom. BUT I CANT because I have to switch off one and reconnect to another. Now there may be pertinent reasons why this may not be allowed (can't think of any, as we password protect the connections to whatever device is connected). Unless its a Bluetooth protocol spec which states this isn't allowed because of concerns with "hijacking" bluetooth connections ??!!, but I'm only guessing. But if you hear or find one would be interested. You are right it is a simple OEM tweak only. Regards Bassrock

Hello, Fully agree with your rationale. However:- I could possibly help, and so could many others no doubt, but could you let us know the make/model number of your pocket PC and the software platform it runs off. Without this info I fear we could go down many paths. Regards Basrock

Thank you Kitty Hawk. Haggis Hunter, if you wish the challenge refer: http://www.geocaching.com/seek/cache_detai...58-92156a43426c Sounds a bit of a sod, I wad be laith to rin an' chase thee ? Bassrock

My question being fairly new on the scene is :- What is an Interception TB. Bassrock

Maybe dedicated GPS systems aren't the solution. I use a mobile phone with TTM5 for Navigating to as near as is possible to the geocache by road. I then use mapview on the phone to direct me as exactly a dedicated GPS would do. But with mapviewGPS I can load OS map sections and calibrate with software to use in the area I am working in. OK it is fiddly, limitations are in the size of memory card I have. http://www.wild-mobile.com/eng/viewproject...21e7cccea6462d3 But have a look, comments appreciated. Bassrock

""Can anyone explain why this is? The GPS satellites are all in low orbits, so the relative velocities between each satellite and the GPSr will be quite large. How is it that the software on the GPSr can cope with satellites flying around the sky, but can't cope with the receiver crawling around the earth?" My response:- Altitude of orbits (low or high) is probably irrellevant in respect of relative velocity to us on ground, relative velocity is still fast/large whatever.. (as each satellite is 12,000 miles up travelling at 2000mph,) depends on how high and type of orbit. Sensitive gps receivers will pick anything up these days, but the ionosphere, cloud, rain, ice and virtually every single factor at every altitude from the satellite to us, that can effect/influence a GPS signal will do so in some manner, whether delaying, attenuating or bending the signal. The software has been adapted over the years to cope with all this, so we joe public switch on and expect perfection. Thats OK if we are out in a field with clear sky everything should work. But we want to walk with it, cycle with it, drive with it, fly with it and some people even want to geocache with it !!. As far as I am aware the antenna design on most GPS receivers dictates the antenna has to point up or towards the satellites (e.g. the antenna cannot "see" 360 degrees, maybe 180 at a push (I don't know). So if you drop it, cover it for a couple of seconds the GPS update rate of 1 second may not be able to cope with the outage and therefore give a jumpy/staggered type update on display. Then don't forget as with all radio type signals there will be areas that just don't get a GPS signal or there may well be local interference of signal e.g. has anyone had problems picking up a signal when near 30Kv pilons ?? Don't know if I've answered the question, but at least it may stimulate discussion. Bassrock (PS clue to my location is in my name)