Ardusub POSHOLD without baro or with bme280 external i2c barometer

I’m trying to get poshold only on lat and long for my ardusub, I want to be able to have POSHOLD without any depth sensor on ardusub 4.5.

Is there a way to bypass it? when i do poshold it wont let me do that and write “warning: need alt estimate” and depth sensor is not connected.

lmk if you have any question