Furuno GP-3300, GD-3300 manual Satellite schedule, Frequency deviation, 10-2

		Table 10-1 GPS indications on the navigation data display
Indication	Meaning
CST	COLD START. The GPS receiver was started up with no Almanac. This condition
	occurs when the power is turned on for the first time or when the GPS memory is
	cleared.
IMP	IMPOSSIBLE ro receive. The GPS receiver is receiving current Almanac because the
	existing one shows no satellites within line-of-sight of the GPS receiver.
ACQ	ACQUIRING a satellite. According to the Almanac in the GPS receiver, a satellite is
	available in line-of-sight, and the GP-3300 is aquiring it but has not received it yet. If
	the ACQ indication remains on the display for a long time without changing to "ALM"
	(see ALM below), the receiver section may be faulty. (You can do the self test to verify
	receiver condition.)
ALM	ALMANAC is being received. According to the Almanac in the GPS receiver, three (or
	four) satellites are not in line-of-sight. Therefore, the receiver is receiving the latest
	Almanac to fix its position.
INT	Position-fixing INTERRUPTED. Reception is interrupted due to objects around the GPS
	antenna, etc. According to the Almanac, HDOP is still superior to the HDOP threshold.
	When the lost satellite reappears, calculation of position will be resumed.

Satellite schedule

The satellite schedule shows predicted date and time when the GPS receiver can fix its position by receiving GPS satellites. The time varies according to DOP threshold and position-fixing mode set on the GPS INITIAL SETTINGS menu.

Example 1

Indication: “24 HOURS OK”. (Position fixes by GPS available round the clock.)

Example 2 1. 11:30

(GPS position fixes available from current time to 11:30 of the same day)

2. 9/1 12:00 → 3:51

(GPS position fixes available from 9/1 12:00 to 9/2 3:51)

3. 9/2 4:05 →

(GPS position fixes available from 9/2 4:05 to 9/3 4:05.)

Frequency deviation

This indication shows how many Hertz the GPS receiver is deviating from its assigned frequency of 1575.42 MHz. Less than about 3000 Hz is normal. Any deviation higher than that will mean more time is required to fix position.

10-2