HUD SPI

[Elof]

Every single time I use the F16 and have set way-points my hud SPI always misaligns. Is this normal. I Can take off and get to my Waypoint, dp what I need to do there and when I rbt to the set waypoint for Base my Hud SPI misaligns every single time. Is this normal?

[RogueSpecterGaming]

48 minutes ago, Elof said:

Every single time I use the F16 and have set way-points my hud SPI always misaligns. Is this normal. I Can take off and get to my Waypoint, dp what I need to do there and when I rbt to the set waypoint for Base my Hud SPI misaligns every single time. Is this normal?

Yeah it is called INS drift. Read the manual.

[razo+r]

56 minutes ago, Elof said:

Every single time I use the F16 and have set way-points my hud SPI always misaligns. Is this normal. I Can take off and get to my Waypoint, dp what I need to do there and when I rbt to the set waypoint for Base my Hud SPI misaligns every single time. Is this normal?

Have you pressed CZ? No? Do it, it is very important in the F-16. It will become your best friend.

[Gilligan]

One of two things are happening:

Normal INS drift. Over time the INS system builds up small errors over time called "drift." The longer you fly, the more errors stack, the further off your SPI's will appear vs the intended terrain markers. The INS system in the F16 is "GPS corrected," so if you are flying with the GPS enabled after a certain amount (IIRC about 300 meters) of drift accumulation the GPS will attempt to "correct" this error but it can still be a couple hundred meters off. 

 

The second thing that could be happening is that you are offsetting your SPI via one of the sensor systems like the TGP, Ground Radar, or HAD/HTS. Take the TGP for example, if you slew the cursor off the steer/mark point you have selected and initiate a point/area/INS lock on a location, there are X, Y, and Z offsets to that point relative to steer/markpoint that are automatically stored and  will be applied universally to all other steer/mark points. To cancel out or "zero" out this offset, use the cursor zero function either by pressing the corresponding MFD button, or by using TMS down short. 

[Elof]

THank you for the Help folks. Also for the explanation Gilligan