Is it harder to get a GAN (M4) HSD connection than a GAN (M4) voice connection?
It can be in very busy circumstances because a HSD connection occupies more channels as it operates at 64Kbps compared to a voice connection at 4.8 Kbps. Also a stronger signal strength is required to be received by the SatPhone for HSD and so alignment of the antenna may be a little more critical.