MobiNav

Finalement, le 605 GPS nous laisse un goût de logiciel inachevé. Des lenteurs occasionnelles, des itinéraires qui passent par des voies piétonnes, un récepteur TMC qui ne capte pas d’info-trafic, des choix étranges dans les menus, sont autant de défauts que l’on retrouvait sur les premières générations de GPS. Les concurrents ont aujourd’hui corrigé la plupart de ces erreurs de jeunesse, et il faudra au 605 GPS passer par là pour venir concurrencer les PND  »purs et durs » sur leur terrain de prédilection. Après une amélioration du logiciel, le 605 GPS pourrait devenir un GPS très intéressant quand on connaît les prouesses dont il fait preuve en usage multimédia.

Il n’est pas pour autant mauvais et saura vous mener sans encombre d’un point A à un point B. Il se destine à ceux qui cherchent un bon lecteur multimédia qui sert occasionnellement de GPS, mais pas à ceux qui cherchent un bon GPS qui fait aussi office de lecteur multimédia. (>>more)

[source: 国际电子商情]

联发科技(MTK)去年正式进入GPS市场，让众多粉丝无比兴奋。这些粉丝希望MTK能像在手机芯片市场的成功一样，带领其众多客户在GPS市场快速赚到钱。 然而，时间几乎过去一年，其众多粉丝开始失望。因为，到目前为此，MTK的GPS方案在价格上没有任何竞争力，反而是另外两家台湾厂商MStar和SkyTraq(威航科技)走得更前一些。 Read the rest of this entry »

Worldwide shipments of GPS-integrated mobile devices will grow at an annualized rate of nearly 40 percent over the next five years, reaching 834 million units in 2012, according to market research firm Parks Associates. more »

An NMEA checksum is calculated as the XOR of bytes between (but not including) the dollar sign and asterisk. This checksum is then compared with the checksum from the sentence. If the checksums do not match, the sentence is typically discarded.

Source : GpsBusinessNews 

According to figures given today to GPS business News by market research firm GFK, 2.45 million Personal Navigation Devices (PND) should be sold in France in 2007 against 1.23 million in 2006. The key reason to this growth is the falling price of such devices. Between 2005 and 2006 the average selling price fell from €493 to €370, a 25% decrease. The trend is continued in 2007: half of the market is now made by devices below the €200 price point. Read the rest of this entry »

[source: GPS business news]

According to the 2007 Business Wireless Smartphone Customer Satisfaction Study released this week by JD Power and Associates, More than 40 percent of Smartphone business users in the United States would like GPS capabilities on their device.

The study also finds the following key Smartphone business wireless usage patterns: 26 percent would like Wi-Fi capabilities, 22 percent want touch screen and 19 percent would like to have a TV integrated into their device. Thirty-five percent of Smartphone owners download third-party software. Popular software downloads among business users include games (51%), travel-related programs (42%) and business applications such as Microsoft Word and Excel (36%).

The 2007 Business Wireless Smartphone Customer Satisfaction Study is based on responses from 1,089 business wireless customers who currently own a Smartphone device. Findings are based on data collected in August 2007.

Specification 

20 parallel channels.
Built-in patch antenna.
Companion CD: Adobe Acrobat Reader® for Pocket PC – PDF file viewer﹜NAV-52 Handheld Manual.
Processor: Centrality Atlas Processor at 200 MHz.
Operating System: Microsoft Windows CE. Net 4.2 Core Version.
Memory: 32 MB NAND flash memory and 64MB SDRAM memory for operating system and embedded applications.
Weight: < 180 g
Size: 95.5(L)x77(W)x22(H) mm
Car Holder / Charger:
    Input voltage: 11V. ~ 28V.
    Output voltage: 5.5V. +/- 0.3V.
Battery:Rechargeable 2600 mAh. Polymer Li-ion 
        Battery life: 8 ~ 10 hrs.
Extension Slot:SD card slot, over 1 GB.
Display:
    3.5" high-brightness & contrast ratio transflective TFT LCD (16.7 M colors) with touch screen.
    240 x 320 resolution.
LED: Red/Green LED for battery charging status.
Audio:Built-in speaker.
Software volume control.
Operation Temperature: -10 ^{0C ~ 40 0C
Storage Temperature: -20 0C ~ 70 0C
Mini-USB Connector: USB client; DC power in}

SIF stands for SiRFInstantFix

The satellite orbit information retrieved from an almanac is much less accurate than the information retrieved form the ephemeris. If during a startup period, only almanac information is available, (e.g. while the ephemeris still is being downloaded) the receiver still is able to navigate based on almanac orbits.

With almanac navigation enabled, when a new satellite reised and its reception ujst has started, the receiver might use an almanac to use this satellite in the navigation solution until the ephemeris is fully retrieved.

With an almanac only solution, the position will only have an accuracy of a few kilometers. Almanac Navigation allows much faster start up, as there is no need to wait for the completion of the ephemeris download(>18s).

AGPS stands for Aiding/Assisted GPS.

The requireed aiding data:

• ALmanac or ephemeris data
• Position & Time