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To start a measurement; wait until the GPS reciever is ready and then press start. If the positioning is a litle shaky in the begin, press restart as soon as it has stabilized.
Feature requests are welcome.
Sugar log is only a tool for keeping track of sugar levels. Pleases contact a health professional for any health related advices. It is the users sole responsibility to determine in which way he/she decides to use it, and the developer recommends that important data is kept track of in an alternative way as well. The developer should in no way be held responsible for any eventual loss of such information, not even if such loss occurs because of poor design of this or any future version of the application.
The black arrow won't appear until your possition is determied by the GPS. Callibrate the compass by turning the phone around in different direction.