iXBlue GAPS - 8.4 Procedure

GAPS - User Guide
8.4 Procedure
Prerequisit
The INS of GAPS must be aligned (see section 9.2.1).
Box-in
Once the transponders have been deployed, they must be calibrated. Box- in of one
transponder typically requires 100 USBL fixes. Once calibrated, the positions of the fixed
transponders have to be input in the dynamic positioning parameters. There are two ways to
input these parameters:
● Recover these coordinates by clicking on the Get Current Position button (only
available when the USBL system is tracking) to fill these fields automatically with the
current USBL position of the transponder.
● Input manually the position of the transponder in the dedicated fields.
Only one transponder can be set as a reference at a time. The position of the USBL antenna is
computed with respect to the position of the reference transponder.
DP Protocols
The protocols to select in the output configuration and that can be read by a DP system are :
● HIPAP HPR 400
● HIPAP HPR 418 fix or mobile
● KONGSBERG BCD
GAPS can be used without GPS.
Options
Four different modes are available:
● Automatic (default): the GPS, LBL or inverted USBL are used in the order:
> Position sensor
> LBL if no GPS available
> Inverted USBL if no LBL and no GPS available
● GPS Only: only data from GPS are used for DP
● LBL Only: only data from LBL are used for DP
● USBL Only : only data from USBL are used for DP
1. Click on options.
2. Under Dynamic Positioning, select Automatic (default), GPS Only, LBL Only or USBL
Only..
3. Click on OK to validate your choice.
4. Moore the transponder(s) and sail the vessel to the center of the field of transponders.
5. Run the next three steps for each or the transponders.
6. In SETUP > TRANSPONDERS, click on Change Settings for a moored transponder.
In the Dynamic Positioning section, let the Mode to None.
In the Filtering section, set the Type of filter to Fixed to start the averaging .
7. Click on OK to exit the transponder settings and switch ON the transponder.
MU-GAPS-AN-005-H - November 2019 139