Your GPS device should have a clear view of the sky to obtain a Satellite lock.
If your device has a clear view of the sky and still not locking onto satellites please try the following:
1. Goto your main menu by pressing your menu button twice
2. Select Setup - Select System
3. Select Satellite - Select Satellite System
4. Select GPS only and re-check for satellite signal
5 If you device now locks onto Satellites go back to Setup - System - Satellite - Satellite system and change to Multi-GNSS and re-check for satellite signal, if all now okay leave your device set to Multi-GNSS
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