simulate tracks starts from 0, 0 - not start of observed data

[mjw-marine]

I'm using your vignette to try and create some random data with the mule data from your package

random_scen <- create_scenarios_crw(rho = 0)

set.seed(1)

sim_null <- simulate_tracks(scenarios = random_scen,
                       n_steps = nrow(mule),
                       n_tracks = 1,
                       start_loc = data.frame(x = mule$x[1], y = mule$y[1]),
                       sl_par = c(0.6, 330))

I've noticed that the first location of the track generated here does not start at mule$x[1], mule$y[1], rather at x = 0.000, y = 0.000. If you replace the exact start location you require e.g. x= 535031, y = 4792508, it still has the first location of the simulated track at x = 0.000, y = 0.000.

Is this a bug? I would assume the start location should be what you set it, rather than defaulting to x = 0.000, y = 0.000. Is that right? Or maybe I'm misunderstanding and this might be user error at my end.