I think what OP bought was a portable cellular WiFi
hotspot mistakenly thinking that WiFi access outside a WiFi zone was what was needed for position fixes.
Primarily for clarification to OP...
- GPS = Global Positioning System based on a system of satellites - provides "one-way" positioning data - provides position information down to a few meters with proper GPS decoding
- WiFi = Wireless data communications
usually provided by a wireless router or other hot spot - used for two way data communications
- i.e. needed to download maps to Navionics
- Provides "location" but not "position
- 3G = Cellular Data Communications - Provides two way data communication through cellular telephone infrastructure. Requires a sim card and data plan. Can be used for location data but not position data.
Enhanced location Services - using the WiFi location or 3G cellular location to help the GPS acquire the satellites quicker by narrowing the search for satellites to those in the expected area rather than the Global Satellite
- The Navionics application needs GPS to function properly - If passed location information from WiFi or cell towers it will plot the position although inaccurately - If not receiving WiFi or Cell Data it won't plot anything
- WiFi provides "location" services based on the nearest Internet
Node it is using - when it is receiving WiFi - This is accurate enough to tag a picture with - "Bob is in Melbourne on Flinders street" but not much more
- Non-3G capable iPads do not have a GPS installed. The best you get is location through WiFi. If you add a cellular hot spot you will get cellular location and still not get position data
At this point OP needs to add an external GPS receiver that is compatible with the iPad