For the last decade I have used an Android phone as my GPS device. I've never, ever, had GPS signal loss, even with the phone sitting in the cupholder at the console. I bought (and still have) a Garmin Glo, which is an external GPS antenna. I used it for several months but quickly realized it only provided a minuscule improvement in accuracy.
$50 hardware mini HDMI output for external displays. Adapts to HDMI via cable, subject to availability. $50 GPS antenna upgrade with GLONASS support. $225 wireless AIS receiver with antenna. $100 external Bluetooth GPS antenna. Needed in rare circumstances, such as down below use with a metal hull.
Bingfu Car Dash Cam GPS Antenna Vehicle Dash Camera GPS Antenna Waterproof Hidden Adhesive Mount 3.5mm Plug GPS Antenna for Car Dash Cam Dashboard Camera Safety Vedio DVR Recorder GPS Tracker Receiver. 4.2 (188) $1299. FREE delivery Sun, Apr 2 on $25 of items shipped by Amazon. Or fastest delivery Thu, Mar 30.Let's suppose that you have a GPS-enabled Android phone and a GPS-less Android tablet. On the phone, you can install a program that turns it into an NMEA GPS---that is, a GPS receiver that can ``talk'' to other devices using the NMEA protocol. On the tablet, you will install a program that connects to the NMEA GPS and reads the location info
On one motherboard i tested, this leaded to total failure of the gps receiver side (needed an external hi gain antenna to get a fix, otherwise totally dead). The reason for this problem is the fact that when bridging the antennas you create a ground loop on witch wifi/bt signals (higher amptitude) will get into the gps side, damaging it.