Navionics not working with an IPad PRO 5th gen

Do you have a WiFi Only model of iPad, or WiFi+Cellular?

Only WiFi+Cellular models of iPad have GNSS/GPS - this being a function of the iPad Cellular chipset. WiFi Only models of iPad have no GNSS/GPS capabilities with which iPad Location Services can derive location. This fundamental difference may significantly impact your ability to use mapping Apps - in particular if real-time positioning (e.g., a moving map) is required.

WiFi Only models can only “infer” their location from a database lookup of neighbouring WiFi networks for which the geographic location is known, or the geographic location of your public IP address. For static applications in urban locations, where the location of IP public IP addresses and WiFi networks are known, an “inferred” location can be relatively accurate. However, in rural locations, or when using a Cellular/Satellite/VPN connection, location accuracy of an inferred location [if it works at all] may be very inaccurate. 

Your iPhone does have GPS capabilities - however, the iPhone’s derived GPS location is not shared with other devices via a hotspot tether.

All this has significant implications for non-static mapping applications. If you need to have moving maps, or have future flexibility to do so, you’ll need to consider a WiFi+Cellular model of iPad. Choosing a cellular model does not commit you to adding a cellular service plan for the iPad, but ensures that you have immediate access to GPS/GNSS positioning services.

Your available options are:

• Substitute your WiFi Only iPad for a WiFi+Cellular model; this does not commit you to provisioning Cellular service for your iPad, but does provide the needed GPS functionality for the iPad.
• Add an external GPS receiver to your WiFi Only iPad. These are often used in marine, aviation and vehicular applications - and can be either directly connected via Lightning or via Bluetooth. Their are various third-party manufacturers, of which two well respected options are BadElf and Garmin Glo.

A WiFi only iPad does not have an aGPS system. Only WiFi+cellular models have GPS/GNSS. WiFi only models only have the ability to use WiFi and Bluetooth micro-beacon location information. This is not new as iPads have always been this way.

You can check the tech specs for iPad models online at the Apple web site. Eg. The current iPad Pro:

“Location

All models

• Digital compass
• Wi-Fi
• iBeacon microlocation

Wi-Fi + Cellular models

• GPS/GNSS
• Cellular”

So is your current iPad Pro model a WiFi only mode, or a WiFi+cellular model? The fact that your iPhone worked fine would imply your iPad does not have an actual aGPS system as it is WiFi only (all iPhone models have an aGPS chipset)?