GPS

[Cumbrian Neil]

Some of the newer ones cope fine with trees.

I personally use a Garmin Vista C and it does great in dense tree cover... it is WAAS enabled. Now to spend the money on upgrading the basemap.

CN.

 

[AndyF]

Some of the newer ones cope fine with trees.
One of the manufaturers at the recent Outdoors show was showing a unit that had a lock from within the NEC

Read somewhere that you can now get a "GPS" that also includes an inertial navigation system so that you still get a position in tunnels. In theory it's possible though the IN system would have to be a hell of a lot smaller than they were the last time I played with one. If you can build an inertial navigator that small today and get reasonable accuracy you just stick it in your pocket and walk round the cave (or grovel or swim) and you've got a survey.

I think thats an idea that has floated for years. Don't think it actually exists anywhere... It would be a surveyors dream

 

[Cave_Troll]

you try persuading the Royal Navy to lend you the inertial navigation system from a torpedo

 

[emgee]

Some of the newer ones cope fine with trees.
One of the manufaturers at the recent Outdoors show was showing a unit that had a lock from within the NEC

Read somewhere that you can now get a "GPS" that also includes an inertial navigation system so that you still get a position in tunnels. In theory it's possible though the IN system would have to be a hell of a lot smaller than they were the last time I played with one. If you can build an inertial navigator that small today and get reasonable accuracy you just stick it in your pocket and walk round the cave (or grovel or swim) and you've got a survey.

I think thats an idea that has floated for years. Don't think it actually exists anywhere... It would be a surveyors dream

Like I said I read a mini review of one that claimed to work in a tunnel on somewhere like Shiny Shiny. Recent IBM laptops have acceleration sensors sufficiently sensitive that you can wave the entire laptop about instead of using a mouse so the technology is getting there. Being able to tell you're in the Dartford tunnel heading north is still quite a lot easier than telling where you are in three dimensions to a few centimetre accuracy though,

 

[Cumbrian Neil]

We have Bill Clinton to thank for the accuracy of modern GPS units... he's the one who signed the bill to remove the deviation. In retrospect... he wasn't such a bad president afterall... he just liked a bit of totty on the side.

:roll:

CN.

 

[SamT]

Saw a clip on the news lastnight about how Sat nav systems are sending people over some hideous farm track in the Yorkshire Dales past Crackpot farm until they get stuck.

If it had of been last saturday (april 1st) - id have thought it was a joke. I seriously worry about the human race when people are actually following their Sat nav instructions instead of using their eyes. There followed lots of tales of people being sent up the M1 north by mistake etc. :roll:

Im sure the same thing applies to walkers GPS systems.

"Imagine my suprise when I fell off this cliff - it told me to walk straight north - the doctors say I'll be out of hospital in about 6 weeks."

"imagine my suprise when I found myself swept away. It took search and rescue 6 hours to find me clinging to this tree. It told me to go straight ahead"

"imagine my suprise when.. etc etc"