Does GPS install Orientation affect the heading line

[Capt No Fish]

 

I am learning how to fish off shore.  I am using a heading line on an Garmin Echo map to find where my way point is so I can cast to it.  I have my console unit set up like the read where the back of the unit is facing the bow and the screen facing the stern (driver) .  On the bow I put the unit oriented like the picture where it follows the gunnel to get it out of the way.

 

My question is will the bow unit show my heading correctly.  I have the setting to heading up.  When approaching the waypoint is my bow pointing at the way point or is the back of the unit point at the way point.  I do not have a heading sensor installed.  Everything on the charts are based on the internal unit antenna.  And the units are networked together so I can share waypoints.

 

[Tennessee Boy]

The direction the unit is pointing does not matter.  If you don’t have a heading sensor,  it’s assuming you’re heading is the same as the direction you’re moving. This is a good assumption if you’re moving very fast.    You should notice that the heading will be off when the wind or current is moving you in a different direction than the boat is pointing.  A heading sensor is a good investment if you fish off shore much.
 

Full disclosure,  I am Humminbird guy not Garmin but I don’t think it matters.

[casts_by_fly]

TB is correct. Without a heading sensor it will go by your motion. If you’re not going to add the heading sensory then your best bet is to line it up as you’re motoring in and mark a point on the far bank to cast to. Casting rings are helpful also if your unit offers them. 

[Capt No Fish]

Thanks guys, I had hoped this was the case.  I guess I was in doubt because I only found the structure 1x with my jig.  This is probably due to this being new to me and just learning to fish the structure.

 

I will continue to use the point of the bow as my visual direction marker.

[12poundbass]

Try this out. 
 

 

[dorwink]

I have 2 new GPS units and a new AIS so I have the same issue. based on the answers it does not matter for the GPS's,    i hope the same thing is true for my AIS (transceiver) unit.