Training for custom dataset

[sontung2310]

Hi, thanks for your great work!
I want to re-train the model for my own dataset, can I do this? And, I have some questions about defined variables:
'''
lat_size = 250
lon_size = 270
sog_size = 30
cog_size = 72
lat_min = 55.5
lat_max = 58.0
lon_min = 10.3
lon_max = 13
'''
Can you provided more details about the meaning of those variables? And, how can I choose those values for my own dataset?

Thank you!