Can't find satellites
The internal antenna BNC connection (the little steel bayonet that the secures the antenna or extender cable) is a common failure on these units. The threaded retaining ring on the outside of the antenna BNC comes loose when installing/removing the antenna connection, and eventually the BNC rotates and the solder joint inside fails. This happened on mine recently, if you are handy fixing small mechanical parts and a good solderer it is pretty  easy to fix. Remove the batteries, remove all six outer case screws (but not the one with the oval metal plate) and gently pull the housing apart. Check the solder connection of the coax wire to the BNC pin & shield. If it's broken and the BNC is loose in the GPS case, tighten the outer BNC retaining ring VERY tight, add a drop of thin super glue (Hot Stuff or Permabond CyA, etc) to keep the ring/BNC/case mated, then repair the coax solder  connection. Replace all the screws and test it outside. If it's an aviation GPS you would of course have this done by an FAA licensed avionics specialist. Wink wink.
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