Navico WM-2 Installation Manual - Module Data Retention
Troubleshooting | 23
Symptom
Suggestion
Allows overlays
but no data.
Attempt to display weather data over-
lay on your unit. If the unit can ‘see’ the
module (allows overlays) but does not yet
display data, wait 5 minutes and check
Precipitation overlay (updated every 5
minutes).
Module not seen on the network. Check
Connections
Check Signal strength on Weather Options
screen. Observe if strength fluctuates, par-
ticularly if clouds are overhead.
The SIRIUS Marine Weather subscrip-
tion may not be current. Check Weather
Options: ensure that your ESN is specific to
the module you have installed, and that the
subscription is valid.
Note: if you have returned the module for
repair, it will have a new SIRIUS ESN. You
may need to call SIRIUS to update your
subscription with this number.
Module Data Retention
The module’s can store the most recent data in volatile
memory.
This cached data is retained for up to 30 minutes when power is
removed from the module, such as refueling.
If power to the module is restored within that time a unit can
access this data and display it immediately rather than wait for
a full transmission cycle to occur.
The volatile memory utilizes an internal capacitor which must
be charged prior to removing power to achieve the maximum
duration. Charge time is usually about 10 minutes.