There is a really useful app called gps2ip
that lets you share your gps postion from your iPhone to SeaNav running on your iPad when they are both on the same wifi network. This is a way to get GPS on a Wifi only iPad without having to use an external GPS dongle.
Here are instructions on how to set it up.
1. Download gps2ip to your iPhone from the App Store. Here is a link gps2ip
2. On your iPad lookup its IP address – go to Apple Settings/Wifi/ tap the i next to the current Wifi connection and copy down the IP address e.g. 192.168.1.110
3. On your iPhone , launch gps2ip and set it to use UDP push. Tap the i at the bottom right of the main screen,
4. Scroll down to Connection method, tap the i next to UDP and
5. Enter the IP address of your iPad (e.g. 192.168.1.110) and leave the port number as the default e.g. 11123.
6. Tap done and then tap the UDP line to get a tick next to it. Tap Done. Switch enable GPS2IP on on the main screen.
7. Go back to your iPad and in SeaNav go to settings/AIS & GPS Link/, select UDP and enter the port number 11123 (as set in gps2ip). Then tap the Start – you should then see gps data scroll past. Tap done and your iPad will now use the live GPS position, speed and course from your iPhone 🙂
If not – go back and re-start gps2ip. and try again.
P.S. Please make sure your iPhone/iPad time is correct to within 30s – we ignore external gps data if it is more than 30s outside of the time the iphone thinks it is……