Quote:
Originally Posted by s/v Jedi
I know that OP is on a smaller boat, but I recommend to use a NMEA to wifi gateway to link the iPad to NMEA instead of using the internal GPS or a separate external GPS. This gets you the full data stream incl. wind, depth etc.
Also, more importantly, this reduces power consumption significantly. Most of those savings are also achieved with a Bluetooth GPS when it is located close to the iPad, so thus is still better than using the internal GPS.
Yes, the nice thing of the internal GPS (it’s really GNSS because it also uses Russian and EU satellite constellations) is that you don’t need anything else. In that case simply use the wifi link whenever it is available and fall back to internal GNSS when not
Also, with a good wifi gateway, like from Yacht Devices, you get 2-way communication so your iPad can control the autopilot.
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That the best tips that Jedi gave

he is 1000% right this is the way

Just be aware that most navigation apps use ONLY
NMEA 0183 data and for position (eg Navionics and ISailor) it needs the
NMEA 0183 RMC data. The yachtdevices YNBR02 wifi dongle is converting and broadcasting your N2K data also in NMEA 0183 onto your wifi
network and in parallel with his 2nd of 3 server broadcasting the N2K data.
Several advantages this way Jedi recommended:
A) Using Wi-Fi only also reduces heat in the iPads and also other tablets so they shut off later or even never in direct sun.
B) you save
money in only buy the wifi version.
C) You also need to know that the GPS in the apple pro devices is never shut off, even you turn it off it’s still on and uses
battery and transmitting data. It also means that a lot of apps is using the internal GPS as it overrights or ignoring the position data it gets externally and you think it does use the NMEA data.
The only way to block the internal GPS is to put in a SIM card in but don‘t put the pin in and unblock it. This way for
security the iPad Pro blocks the sim module which delivers the location data.
D) the wifi iPads connect to a wide range of BT GPS pucks while the SIM card ones need apple certified GPS pucks which are min double costs and only few to choose to be able that the iPad Pro SIm allows external position data. You can connect via BT but the external data is never used!
E) the internal GPS In IPads is optimized for land use, means 2D, and then corrected via cellular masts and public Wi-Fi’s plus its height
sensor. This can be easily folded by the 3D motion of the
water and you have no cellular or WiFi’s at sea to correct it. Using eg
Garmin Glo2 BT puck which is
marine and aviation certified means it has an GPS that’s optimized for 3D and uses different ways to correct the position electronically to be more precise.
F) That using external BT GPS has its own
battery and therefor significantly enlarge the runtime of the tablet on battery is just a welcomed side effect.