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Old 15th December 2008, 14:06   #16
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I have Casio Protrek PRG 40-SJ, which measures Altitude, but it is not the accurate one as it calculates altitude based on air pressure.

A gps device or logger is much better options

At my home protrek show 180M and GPS shows 213.3M.

Last edited by rkbharat : 15th December 2008 at 14:07.
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Old 15th December 2008, 14:08   #17
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@Thad: yes ,agreed! :( I always see altitude measured in case of railways or some Hill stations as "X meters/feet above M.S.L" .Thats why I insisted that way!
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Old 15th December 2008, 14:21   #18
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Quote:
Originally Posted by Thad E Ginathom View Post
Only if you happen to be at MSL!

Check for wet feet!
This technique should be used with precaution. Low tide may give low readings while high tide may give your last reading.
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Old 15th December 2008, 14:28   #19
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MSL is the base for calculating altitudes. You dont normally "calculate MSL". You calculate altitude, which is based on MSL. For example, the average alitude of Bangalore is about 3000ft above MSL.

Altimeters are used to calculate altitude. Most of them are barometer-based; they measure air pressure and calculate altitude based on a formula. However sophisticated altimeters use other technologies such as radar and GPS. These are mostly used in space/missile technology. Most aircrafts still use barometer based measurement primarily even though they may have backup options to use in case of air turbulence and critical situations such as landing.

Last edited by appuchan : 15th December 2008 at 14:29.
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Old 15th December 2008, 14:54   #20
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Casio Pathfinder series is good for this.

We used for an expedition in Himalayas and it was fairly accurate for us amateurs.
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Old 15th December 2008, 15:36   #21
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Quote:
Originally Posted by RX135 View Post
Casio Pathfinder series is good for this.

We used for an expedition in Himalayas and it was fairly accurate for us amateurs.
I think Pathfinder series in US is same as ProTrek series in India. You can even see the same mountain logo in the background.
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Old 15th December 2008, 15:43   #22
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Quote:
Originally Posted by watashi75 View Post
Casio .....

GPS devices are an alternative option and more accurate then barometric measurements. You could buy a bluetooth GPS receiver or data logger starting 4000 and connect to a bluetooth enabled mobile. You can check out Satguide bluetooth receiver.

The cheapest option of course is Google Earth and its free, provided you know where on Google Earth you are!
I've found my Satguide maps give accurate readouts of heights. Validated it in Rishikesh against the boards kept @ Snow Leopard campsite and also at Rudrapurayag, the board on the road kept by the BRO ( I think). This year June, at Nelliampathy, Kerala, checked it again at the PWD guest house reception and it is 99% correct.

--Ramky
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