GNSS is something strange

Hi.

I’m using with PX4 v1.11.3 and Pixhawk4. And controlled by offboard not RC. And Moving Base RTK. If Moving Base RTK - base station is moved, drone also moved like a follow mode.

In ground, normally everything is very nice. But we want to use this system in ship. And in this case GNSS accuracy is not so good. Here is my logs, one is not bad and the other is not good.

Flight Review - Quadrotor (px4.io)

In this case, drone followed the ship correctly.

Flight Review - Quadrotor (px4.io)

In this case, ship is anchored in the harbor, but GNSS position looks like not fixed. I think it comes from GNSS jamming or noise. But I don’t know how to solve this.

Did you know what GPS jamming indicator? In my case, if I use the RTK then jamming value goes high. Do not use the RTK then jamming value comes low. I don’t know what it is. Would you help me?