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International Journal of Health Geographics 2007, 6:9


build on the industrial expertise and strengths of one of the project partners, Corscience GmbH & Co KG, Ger- many, in developing tracking systems (Figure 2) [15].

It is noteworthy that location sensitivity/awareness is now an FP7 (EU Framework Programme 7) trend/"require- ment" for 'personalised health status monitoring' projects [16], so CAALYX and a few other projects like EmerLoc [3] are quite ahead of others in this respect.

Current issues and limitations of the location- based/GPS features in CAALYX and some possible workarounds Failure to establish a GPS fix in difficult environments The geo-positioning module in CAALYX might fail to establish a GPS fix when operating in some urban can-

yons/foliage/coated windshield environments, and indoors/inside buildings (e.g., inside a shopping mall). One possible workaround would be to develop (as part of a follow-on project) a more comprehensive and robust geo-positioning solution for mobile older people, com- bining multiple geo-positioning technologies to cover locations where conventional GPS alone would fail. Such a hybrid, "intelligent" solution should be able to automat- ically and transparently select and switch between multiple geo-positioning methods as appropriate/necessary to ensure uninterrupted location functionality. Other geo- positioning technologies to consider in this regard besides conventional GPS include:

Assisted GPS (A-GPS) and A-GPS over the Internet: can speed up the time to first fix in difficult environments

Figure 2ce mobile GPS tracking system Corscience mobile GPS tracking system. Diagram showing the main components of Corscience mobile GPS tracking sys- tem.

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