tripp0090 Posted February 2, 2008 Share Posted February 2, 2008 what is the little hole under the usb and above the batteries Quote Link to comment
+MaliBooBoo Posted February 2, 2008 Share Posted February 2, 2008 I think it's for sound. Quote Link to comment
+julianh Posted February 2, 2008 Share Posted February 2, 2008 I think it's for sound. It's the air vent that the barometer uses to get access to the ambient air pressure. Quote Link to comment
tripp0090 Posted February 2, 2008 Author Share Posted February 2, 2008 I think it's for sound. It's the air vent that the barometer uses to get access to the ambient air pressure. ok cool. thanks guys Quote Link to comment
SiliconFiend Posted February 2, 2008 Share Posted February 2, 2008 By the way, it's not a Sirf Star III chip. It's thought to be a MediaTek, or perhaps something that Garmin has come up with on their own. Quote Link to comment
+yanr Posted February 2, 2008 Share Posted February 2, 2008 Can't be for the barometer, my Venture Cx has that hole as well. I think it's for sound. Quote Link to comment
SiliconFiend Posted February 2, 2008 Share Posted February 2, 2008 Can't be for the barometer, my Venture Cx has that hole as well. I think it's for sound. No, it's for the barometer. They use only one case design. On the units without the barometer, it's just a hole. Quote Link to comment
+julianh Posted February 3, 2008 Share Posted February 3, 2008 Can't be for the barometer, my Venture Cx has that hole as well. I think it's for sound. On units that HAVE a barometer, you can easily prove that it is the air vent: Have the elevation page displayed. If you squeeze the top of the unit by pinching the front and back between thumb and forefinger, being careful to not cover the vent hole, you will see the apparent elevation drop by a few metres, but it will quickly return to the original elevation within a second or two. Release the pressure between thumb and forefinger, and you will see an instantaneous elevation rise, which quickly returns to original elevation. This is all due to air moving in and out through the vent as the air space volume inside the casing changes. Repeat the experiment, bu this time being careful to seal the vent hole with your index finger. Now you will be able to get a much bigger apparent elevation drop (50 to 100 metres), and the apparent elevation will not change for as long as you keep the vent sealed and the pressure applied. As soon as you uncover the vent, the apparent elevation will return to the original value. To reduce manufacturing costs, Garmin seems to only use one plastic mould for all models in a series, regardless of whether it has the barometric sensor. (Even my humble yellow eTrex with no bells and whistles at all had the vent hole.) Only the plastic colour and the decals vary between different models. Hope this helps. Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.