I have a GWN-Q1000 which in all respects works as it should except for the sunrise/sunset function. The closest city code for my home time is Los Angeles (LAX). My location for sunrise-set is Lon 121.3 W, Lat 38.1 N., my actual home. When I input these settings my sunrise-set readings correspond not only with my local printed and Internet times but also with the readings on my Rangeman 9400 and B1000. After a few days when I check sunrise-set on the Gulfmaster I find the readings off by ten minutes or more. When I check my previous settings for Lon and Lat I find they have changed to Lat 34.1 N and Lon 118.2 W which are the settings for Los Angeles. My Rangeman watches do not change like this and are always accurate.
Can anyone explain why this happens? Does this model automatically reset this function to the default home time location or is it a defect with my particular watch. It would seem to me that once I input my location that should be it since the watch does not have the ability to actually know it's location independently. Any thoughts?
Edit: Thankyou for your kind responses.