Dow Jones Industrial Average
The Dow Jones Industrial Average is a well known indicator of the overall health of the economy calculated using the current value of a variety of stocks along with a periodically adjusted divisor. The opening value of the Dow Jones Industrial Average is used as an entropy source in the Geohashing algorithm.
If you're programming a geohashing calculator, mapping service or other implementation, you'll need a source for the current and historic DJIA value. This page lists known sources and ways to access them and access restrictions.
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Television
In areas without (instant) internet access, you need to know the current DJIA to calculate today's coordinates manually. That probably means by using a cellphone or notebook with an offline calculator.
Europe
Channel N24s teletextpage 301 shows the DJIA opening value:
SMS
Unfortunately, a Geohashing Short-Message-Service has not been set up. Yet.