http://www.realtechnews.com/posts/4751 Independent Tech News and Product Reviews from former VP and head of CNET.com and Longtime Computer Shopper Columnist, Alice Hill author of the popular "Hard Edge" column. Originally named AliceandBill.com. Tue, 07 Oct 2008 05:37:13 +0000 http://wordpress.org/?v=2.0.4 http://www.realtechnews.com/posts/4751#comment-464430 Mon, 14 Jan 2008 03:43:00 +0000 http://www.realtechnews.com/posts/4751#comment-464430 hi all, been living in a cave so new to all this gps receiver with smartphone and pda. need help... just got my first smartphone (t-mobile dash) last week and a regular cell a few months ago. do you need a data plan from your wireless carrier (t-mobile) to get driving direction using your mobile phone with a gps receiver? i also want to use it with a gps golf software. what are some of the more accurate gps receiver with hi all,
been living in a cave so new to all this gps receiver with smartphone and pda. need help… just got my first smartphone (t-mobile dash) last week and a regular cell a few months ago.
do you need a data plan from your wireless carrier (t-mobile) to get driving direction using your mobile phone with a gps receiver?
i also want to use it with a gps golf software.
what are some of the more accurate gps receiver
with

]]> http://www.realtechnews.com/posts/4751#comment-253053 Tue, 21 Aug 2007 21:37:33 +0000 http://www.realtechnews.com/posts/4751#comment-253053 Looking at the specs it appears it only runs on the US GPS system, not any of the other systems and only on the standard 1575MHz band. So would someone tell why 51 channels is better? Normally each channel relates to a satellite that the receiver can get data from and is actually done with corellators in the chip that look for the digital data sequence of the satellite of interest. To add channels it is simply more transistors on the chip. Last time I check there were 27 GPS satellites in orbit. 3 spares and 24 active. So at any time there is normally 12 on your half of the world. This is why most GPS receivers were designed with 12 channels. If you use suitable software to look at the extra data in the NMEA sentences you can get a plot of where they all are in the sky relative to you and what the signal strength is. In normal operation it very unlikely that 12 satellites can be 'seen' at any one time. So 51? Is there something I'm overlooking? To be fair the 20 hours is impressive, if it's true. If I was paying I would look at how the -158dBm sensitivity compares with other units. Looking at the specs it appears it only runs on the US GPS system, not any of the other systems and only on the standard 1575MHz band. So would someone tell why 51 channels is better? Normally each channel relates to a satellite that the receiver can get data from and is actually done with corellators in the chip that look for the digital data sequence of the satellite of interest. To add channels it is simply more transistors on the chip. Last time I check there were 27 GPS satellites in orbit. 3 spares and 24 active. So at any time there is normally 12 on your half of the world. This is why most GPS receivers were designed with 12 channels. If you use suitable software to look at the extra data in the NMEA sentences you can get a plot of where they all are in the sky relative to you and what the signal strength is. In normal operation it very unlikely that 12 satellites can be ’seen’ at any one time. So 51? Is there something I’m overlooking? To be fair the 20 hours is impressive, if it’s true. If I was paying I would look at how the -158dBm sensitivity compares with other units.

]]> http://www.realtechnews.com/posts/4751#comment-252957 Tue, 21 Aug 2007 15:45:06 +0000 http://www.realtechnews.com/posts/4751#comment-252957 [...] From: realtechnews Related posts: [...] […] From: realtechnews Related posts: […]

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