Beste,
sinds kort in het bezit van een vista C van garmin toen ik hem kreeg gaf de gps keurig aan dat wanneer ik stil stond ik ook echt stil stond nu , twee firmware updates verder, beweegt mijn gps binnen de miswijzing als een idioot ik haal topsnelheden van 40 kmh te voet notabene maar stil staan doe ik niet echt meer
mijn trip comp heeft zo geen betrouwbare functie meer
ik heb garmin daarover gemaild kreeg als antwoord
Dear Jan
Thank you for contacting Garmin Europe.
You can revert to old software if you wish.
Because of our ISO standards, we cannot ship out previous versions of our
firmware, but they are available, readily, from this link,
<http://www.gpsinformation.org/perry/agree.html>. It is one of the may
useful links out of GPSinformation.net.
However the reason why the unit will not detect any 'stopped time' will be
due to the GPS accuracy.
With the GPS accuracy the satellites can place your unit in a 15m radius
around where you actually are.
This will continuously occur throughout your walk. When you stop, if you
imagine satellites place your unit 3m behind your actual position and the
next second (although you have not moved) the satellites place your unit 5m
in front of your position.
This gets updated every second so even if you have stopped the unit may
still belive it is moving.
Factors that can degrade the GPS signal and thus affect accuracy include the
following:
Ionosphere and troposphere delays - The satellite signal slows as it passes
through the atmosphere. The GPS system uses a built-in model that calculates
an average amount of delay to partially correct for this type of error.
Signal multipath - This occurs when the GPS signal is reflected off objects
such as tall buildings or large rock surfaces before it reaches the
receiver. This increases the travel time of the signal, thereby causing
errors.
Receiver clock errors - A receiver's built-in clock is not as accurate as
the atomic clocks onboard the GPS satellites. Therefore, it may have very
slight timing errors.
Orbital errors - Also known as ephemeris errors, these are inaccuracies of
the satellite's reported location.
Number of satellites visible - The more satellites a GPS receiver can "see,"
the better the accuracy. Buildings, terrain, electronic interference, or
sometimes even dense foliage can block signal reception, causing position
errors or possibly no position reading at all. GPS units typically will not
work indoors, underwater or underground.
Satellite geometry/shading - This refers to the relative position of the
satellites at any given time. Ideal satellite geometry exists when the
satellites are located at wide angles relative to each other. Poor geometry
results when the satellites are located in a line or in a tight grouping.
Regards,
Andy Phillips
Product Support
Garmin (Europe) Ltd
Een heel verhaal en plausible maar toch een tikkie onbevredigend heeft 1 van jullie ook een garmin raad ik aan dit zeker te melden misschien dat ze bij meer meldingen toch wat verder willen kijken
tot die tijd draai ik de firmware updates terug naar 2.30 en wacht af
