TZT12LF gps position not accurate

[anthony]

Hi

I have TZT12LF and using internal GPS for my plotter.

Recently i noticed that my GPS position is out approximately 50-70 meters.

I never notice such big deviation before so i am thinking that it started only recently.

The deviation is always same , constant distance.

I wonder is there anything i could do to make it more accurate , like calibrate or something when i am at some knowing marking.

I do have PG700 heading sensor connected as well.

Thank you

 

[Taniwani]

The only possibility I can imagine, would be that you have accidentally set the GPS antenna position to some incorrect value. In initial setup you can set the GPS antenna position relative to your boat by setting distance from bow and offset from the midship line (neg is to port).

The position that will be shown is the calculated center of the boat considering the length given and the distance from bow.