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5.
Winter storage of the card and Device can be on board the vessel. Note
the temperature tolerance of the card – most have a range of -40 to +85° C,
and a working temperature range of -25 to 85° C.
6.
The Recorder is sensitive to the response time and write time, so cards
of MicroSD Class 10 or higher are recommended for use with the Device.
In our testing, regular cards (non-professional models) allowed recording
of not less than 99.5% of network messages.
7.
Network messages such as position, course, speed, depth, and wind have
a frequency of not less than once per second. Speed and wind direction,
for example, are sent ten times per second. For this reason, with 30 seconds
of data sampling (which is more than adequate for cruise sailing) even 10% data
loss is insignificant in most cases. Cards from obscure manufacturers or of lower
Class did occasionally show differing results. Some cards demonstrated a very
long response time – as much as 500 milliseconds – whereas Class 10 cards from
well-known manufacturers averaged response time of less than 5 milliseconds.
This delay could produce significant data loss. Low-speed cards might be
adequate for amateur photo cameras, but are not adequate for capturing
real-time data.
8.
The Device has an embedded capacitor, the power from which is used to shut
down the file system safely after the power from the network is turned off.
If a card of lower than Class 10 is use, this Device might not managed
to complete the shutdown of the file system. When the network power is turned
off, the red LED will confirm that work with the file system has been shut down
properly.
